Method and device for determining origin of data carrier disks

FIELD: data carriers.

SUBSTANCE: to determine origin of data carrier disk, errors are used, which appear during manufacture process of master-disk, and are imparted to later batches. Data from said disk in non-corrected form are read, then data about errors is retrieved. Characteristic information about errors is provided and extracted data is compared to characteristic data, which characterizes all data carriers, manufactured by same source. As a result of correlation of compared data, origin of disk is judged either known or unknown.

EFFECT: higher efficiency of copy-protection measures.

4 cl, 7 dwg

 

The SCOPE of the INVENTION

The present invention relates to methods and apparatus for determining the origin of disk storage media, such as compact discs (CDS) and digital versatile disks (DVD).

The prior art TO WHICH the INVENTION RELATES.

Traditional CD-ROM is the data carrier intended only for reading. The original CD was used for storing music and other audio data. However, were developed formats type format CD-ROM (permanent memory on the CD-ROM), which facilitates reliable data storage for use by computers and other digital devices. Format CD-ROM (CD-ROM) proved to be very popular and became a mass storage media for computer programs and other files.

CDs can store about 74 minutes of stereo sound high quality or approximately 650 megabytes of data, or some combination of both. The value of CD for the end user is usually much higher than its physical value, because the value of the data that it stores. This has made it an attractive target for pirates, which can produce an exact copy of the original CD-ROM for a nominal cost and sell exact copies on the market price recorded the and data, getting more profit.

In the case of distribution media, such as magnetic cassettes or video tapes, the quality of copies, fakes have a tendency to fall compared with the quality of the originals due to the distortion of the analog signal during the copy process. However, in the case of disks, such as CDs, no such distortion no, because all the information is recorded in digital form. Consequently, the pirates can produce pirated copies of CDs that are almost indistinguishable from the original or legally produced CDs.

If you could find the difference between the original or legally produced the CD and forgery, the problems caused by piracy, could be significantly reduced. For example, officials monitor compliance with the laws, would have a means of identification of counterfeit CDs and could more easily obtain search warrants and conduct prosecutions. If the CD is a media program, then this program could be used to check that it was loaded with legally produced the original CD-ROM.

The present invention is directed to identify a fake CD-ROM and other drives-media data.

The NATURE AND THE ATTAINMENT

According to the first aspect of the present invention provides a method of identifying the origin of disks-media data, the method includes the steps of reading incorrect data from the disk and retrieve information about the errors of the read data, and comparing the error information and the characteristic information about the error, which characterizes the disks-media data produced by a known source, in order to determine whether the disks-media data made known source.

The production process for disk storage media, such as CDs, begins with the production of the master disk, and the physical production process of the master disk changes, which give the master disk distinctive physical characteristics and cause data errors. The master disc is used to form parties disks, and physical characteristics of the master disk is then transferred, by all parties. Therefore, the group of disks made of one and the same source, as shows the physical characteristics of the disc, and these physical characteristics can be used as a "fingerprint" or identify this source. The present invention relates to all drives-storage media type CD-ROM or DVD-ROM (digital versatile what drives) as well as other optical discs in which data errors that stem from the physical production process, as is played in all discs originating from the same source.

Thus, in the method of the invention the extracted information about the error represents the error resulting from the physical production process, and acts as a "fingerprint" for a particular known source in the production process.

A variant embodiment of the method of the invention can be used to identify that the disk storage medium is genuine, when error information is retrieved from disk, correlates with the characteristic error information for a well-known and legitimate source. Similarly, the lack of correlation between the error information and the characteristic information about the error can be used to identify pirated disk.

For example, the CDs that have been recorded popular music or computer programs, can occur from a number of master discs, released by manufacturing plants located in different countries. Furthermore, each master disk is not used to directly produce the CDs. Each master disk is used in the manufacture nab the RA matrices, used for the production of discs sold in the market. Therefore, it should be clear that, although the "fingerprints" of one of the master disk will be evident in subsequent copies, each stage of the process will also make a "fingerprint" from the sources used in these stages. It is therefore possible that if the error information is extracted in a variant embodiment of the method of the invention, only compared to the characteristic error information from one original source, there will be no correlation. For example, if the characteristic information about the error occurs from one of the master disk, but the real CDs can be manufactured from one of a set of master discs, it may not be a correlation, and yet it would not necessarily mean that the drive when the test turns out to be a fake. Accordingly, unless it is known that the characteristic error information, which should be used when comparing, is characteristic only for one master disk, generally speaking, it will be necessary to store the characteristic error information from a set of master discs or other sources.

The characteristic error information, which compares information about the errors may be errors that have occurred during the manufacture of the known sources. Additionally and/or alternatively, the sources of which are produced discs can be stamped with the characteristic error information to provide signals copy protection designed to show that the disc is from a legitimate source.

The characteristic error information, which compares information about the error can be read from disk, the origin of which is known, for example, in real time, as extracted information about the error. Then, in order to determine the probability that the test drive is a fake, can be carried out correlation between the extracted error information and the characteristic information about the errors of the famous and genuine disk.

In a preferred variant embodiment, the characteristic error information retrieved from the disk group from a common source, for example, known that they are all made from the General and genuine master disk or from a General and genuine matrix. Then information about the errors that are common to each disk group that stands out and is remembered in order to provide characteristic information about the error, which compares information about the error with the test drive.

The methods of the present invention can be used as described, to determine whether the disc is genuine or fake. Alternatively, the method can be used to establish the degree of similarity between the test drive and disks from a known source.

When you read such discs as compact disks or digital versatile disks (DVD), digital data processed with error correction so that the standard output was free of errors.

At various stages guaranteed the process of error correction. For example, if the disk is read by a laser, the generated bit stream, which is then divided, for example, into blocks, each block is translated into bytes, and then into frames, which are subjected to error correction, and then gather in the sector and are encoded. Then the encoded data are divided into subchannels.

In the method of the invention, unadjusted information read from the disks-media data may be taken from any of the stages or levels of the production data. The method requires data that is read, identify errors, which arise from the physical production process. Thus, the data that is read, generally speaking, are not subjected to significant bug fixes.

Alternatively, the standard reading process may be modified so as to remove some regirovannyy drives-media data.

It should be clear that to enable reading of data at any stage or level, and to retrieve information about the error you can use any suitable means of processing.

For example, the reading device for the CD-ROM drive has a drive means for positioning the laser relative to the sectors on the disk, and the positioning data used in such drive means are not free from errors. In addition, readers already have a tool to read these positioning data. In a preferred variant embodiment of the method of the present invention is proposed to extract the error information from the positioning data read from the disc-media data.

If the disk is a CD, preferably, in the method of the invention containing the blocks of the Q-subchannel data in order to provide the possibility of extracting information about the error.

In a variant embodiment of the method of the present invention is particularly relevant for modern CD-ROM drives and their readers is that the method further comprises the steps of reading the blocks of the Q-subchannel CD and determine which blocks of the Q-subchannel have been distorted or ignored, and comparing the list of corrupted or missing blocks characterized the political list of corrupted or missing blocks.

The characteristic list of corrupted or missing blocks can be obtained by reading the group's CDs from a common source, determining for each disk, the list of corrupted or missing blocks, and then forming the characteristic list of corrupted or missing blocks, common to all the CDs mentioned group.

In this variant embodiment is memorized set of characteristic lists obtained from groups of genuine CDs, and error information is extracted from the test CD, compared with all the characteristic lists, whereby is determined whether the CD is genuine.

The present invention also extends to a device designed to allow determination of origin disks-media data, the said device containing a reading device for a drive designed to read unadjusted data from the disks-media data, and processing means for extracting information about the errors of the read data, and to compare the error information and the characteristic information about the error, which characterizes the disks-media data produced from a known source, to determine whether the reading disks-media Dan who's produced from a known source.

In a variant of embodiment of the said device comprises means for identifying whether the disk storage medium is authentic, when error information is retrieved from disk, correlates with the characteristic error information from well-known and legitimate source.

In a variant of embodiment of the said device comprises means for storing the characteristic error information from a variety of known sources.

Additionally and/or alternatively, the device may include means for storing characteristic information about the error that was stamped on the known sources.

The processor may be configured to compare the selected error information with the characteristic error information read from the disc, the origin of which is known, when is the error information.

According to an additional distinctive feature of the present invention provides a device to enable determination of origin disks-media data, the said device containing a reading device for a drive designed to read data blocks from the disk-storage device, the processing means to identify and compile a list of data blocks that were travesty is s or skipped, storage means for storing characteristic list of corrupted or missing data blocks that characterize the disks produced from a known source, and means for comparing the identified list with a feature list to determine whether the above-mentioned disk produced from the known source.

Preferably, the reading device for the disks being arranged in such a way as to read blocks of data positioning so that the blocks positioning data that have been distorted or ignored, would be made in the list and compared with the characteristic list of corrupted or missing data blocks positioning.

In a variant embodiment, in which the disc is the CD-ROM referred the reader to the disks preferably arranged so as to read blocks of Q-subchannel in order to extract information about the error.

In a variant embodiment the processing means is arranged to determine which of the blocks of the Q-subchannel has been distorted or ignored, and to compare the list of corrupted or missing blocks with the mentioned characteristic list of corrupted or missing blocks.

The characteristic list of corrupted or missing blocks may have been produced by sityva the Oia band CDs from a common source, determining for each disk, the list of corrupted or missing blocks, and then forming the characteristic list of corrupted or missing blocks, common to all the CDs from the aforementioned group.

In a variant embodiment of the above device has a storage means for storing a set of characteristic lists received from the group of disks are genuine, and the said processing means is arranged to compare the identified list with all of the characteristic list, whereby is determined whether the test disc is authentic.

The above-described methods and apparatus provide the ability to distinguish between genuine and pirated disk, for example, when all the original disks come from the same source, so they can all carry the "fingerprints" of this common source. However, when a disk group, you have more than one legitimate source, if the test tool does not have access to the characteristic information about the errors or "fingerprint" from all authentic sources, the definition of the origin of the test disk may remain in some doubt. Thus, the test result could be that this CD is probably a fake, because it does not correlate with the stored information about the "fingerprints".

<> Thus, it may be preferable to make the characteristic "fingerprint" or unique identification information about the errors on all the original disks in their manufacture.

According to another distinctive feature of the present invention provides a method of implementation identifying information about the errors in the disk storage device in which the disk-storage device is physically made, either directly or indirectly from the master disk, and in which the master disc is produced through the production process, which is controlled by the processing means, the method containing the step of filing identification data error in said tool handle so that the above-mentioned identification information about the errors embedded in the master disk during its formation.

Thus, all production plants for proprietary material and software could be provided with unique identification information about the error for such program material, from which the identification information about the error is stamped in the master disc during its manufacture and, therefore, in any copy made from it. Thus, the methods and apparatus of the present invention to determine the origin of the drives can reliably identificirovat the original disks and, therefore, all counterfeit.

The methods and apparatus of the present invention can be used not only to identify genuine or pirated discs, but also to block access to pirated CDs.

BRIEF DESCRIPTION of DRAWINGS

The invention is further explained in the description of specific variants of its embodiment with reference to the accompanying drawings, in which:

figure 1 schematically presents the disk-storage device with a spiral track,

figure 2 presents the format of the frame data read from the CD-ROM,

figure 3 presents the block format subcodes data read from the CD-ROM,

figure 4 presents the main data format Q-subchannel,

figure 5 presents the list of locations of data errors,

figure 6 shows the block diagram of the device of a variant embodiment of the invention to determine the origin of the CD-ROM,

figure 7 presents a diagram of the device for embedding identification information about the errors in the CD-ROM.

As is clear from the foregoing that the present invention may be used for any drive-media data in which errors in the data on discs arising from physical production process will be consistent for all disks originating from the same source. In particular, invented the e can be used for compact discs and digital versatile discs (DVDs).

As is well known, compact discs and digital versatile discs (DVD) are created from a glass master disc which is cut by the laser as the disk rotates on the spindle. The intensity of the laser beam is modulated with the data that should be recorded. Each master disk used for the manufacture of Nickel copies that are used for the manufacture of matrices. Commercial compact discs and digital versatile discs (DVD) are made using these matrices. Each master disk is physically unique and will have errors resulting from defects in the glass substrate or photoresistive coating and resulting from variations, for example, the rotation speed of the spindle, and also because of the movement of the laser. Similarly, when the party copies for production of the matrix and then compact disks or digital versatile disks (DVD) are made directly and then indirectly with the master disk, on each copy of the party will be introduced more unique "fingerprint". These "fingerprints", which are physical characteristics, which can distort the data or cause errors in data transmitted subsequent to the parties copies. Of course, each batch due to manufacturing process used for its manufacture, has its own set of errors and the warriors own "fingerprints". Thus, each CD-ROM and digital versatile disc (DVD) has introduced the "fingerprints", one of which can be assigned to each of its predecessors.

When using the methods and devices in accordance with the present invention, a disk group from a common source, for example, all formed by one matrix, analyzed, and identified errors that are common to all disks in the group. Thus, these common errors are "fingerprints" of the matrix and can be compared with errors in the test drive to determine whether the test disk to the same group.

In this invention to determine the "fingerprint" of disk access errors in the data. It should be clear that the data format for the CD-ROM is different from that of a digital versatile disk (DVD). For simplicity, the present invention is described herein with particular reference to CDs. However, the invention is applicable to digital versatile disks (DVD), although the level at which errors in the data format digital versatile disks (DVD), will be different, and to gain access to the errors might require a modified reader digital versatile disks (DVD).

Accordingly, for further explanation con the specific variant of the embodiment of the present invention will now be briefly describes the data format of the CD-ROM.

Data is recorded on the CD-ROMs according to international standard ISO/IEC 10149. The data are on the CD-ROM in a series of recesses varying length in the reflective material CD-ROM. As shown in figure 1, these grooves lie in a compact helix 4, which is continuously unwound from almost the center of the reflecting part to almost the outer side of the reflective side of the CD-ROM 6. For scanning in a spiral reader the CD-ROM drive uses a laser, and it detects the edges of the recesses by measuring the reflectance of the disk when the latter is scanned. The presence of the recesses causes the loss of back reflected light.

The laser generates a beam of light that is reflected from the disc 6, so that its intensity was measured by the photodetector.

The photodetector generates an analog signal that can be identified with the reflectance of the disk in a spiral. The signal is amplified and converted to receive the stream of zero bits with bit installation for each detektirovanie edge. This signal is called EFM-modulated data stream (modulation eight to fourteen) and is the first digital signal from the disk.

EFM-modulated stream is divided into blocks separated by a 24-bit synchronization combination. For synchronization to what minutia followed by three bits of "mixing", and then 33 series 14-bit words, each of which is followed by three bits of "mixing". 14-bit word is passed through EFM-demodulator (e.g., reference table), which translates words into 8-bit bytes. Therefore, the EFM modulation unit, divided by the 24-bit sync combination translates into a "frame" of 33 bytes, as illustrated in figure 2. One byte of each frame is used for the "subcode", and the remaining 32 bytes are the C1 and C2 decoders that use error correction.

Data with fixed bugs out of the decoders in the form of blocks of 24 bytes. These blocks sequentially collected on 98 at the same time, in the sectors of 2352 bytes. These 2352 bytes encode the audio data, but computer data is another layer of error correction, top, leaving 2048 bytes of user data. The bytes of the subcodes going vertically, 98 at the same time, in blocks of subcodes, as shown in figure 3. The first two bytes of the subcodes are the sync bytes and the remaining bytes are divided into subchannels P, Q, R, S, T, U, V and W. the P-sub-channel consists of a high bit to 96 unsynchronized subcode bytes. Block Q-subchannel is obtained from the second eldest bits of the same byte, and so on.

4 shows the basic format of a data block Q-subchannel. As you can see, the first four bytes of the block Q-subchannel n is establet a "control" box 8, the second four are the address (ADR)IO. Followed by 72-bit data Q-subchannel 12, the interpretation of which depends on the value of the address field (ADR). Followed by a 16-bit control cyclic redundancy code (CRC) 14 on the three previous fields. Control cyclic redundancy code (CRC) to detect errors but does not fix them.

Has almost the same number of blocks Q-subchannel, how many sectors on the CD-ROM. From the description it may seem that the blocks of the Q-subchannel correspond to the sectors on the principle of one-to-one, but it is not so, because the C1 and C2 decoders delay some bytes to copy with packet errors.

Blocks Q-subchannel not enjoy the same level of error correction, as the data in the sectors. The tool, which (has) a lot subchannel blocks on the disk does not have a true control cyclic redundancy code (CRC) and, therefore, is distorted because of the natural errors introduced during manufacture of the master disk, as well as wear and destruction.

Typically, the blocks of the Q-subchannel used drive reader CD-ROM for positioning on the CD-ROM. When the address field (ADR) contains "0001", data bits Q-subchannel encode the position of the block in the track from the beginning of the disk. Therefore, each block Q-subchannel has a unique address, which monotonically in trustet.

Block Q-subchannel can be used to record other information, such as a universal peripheral controller/ European international number (UPC/EAN), which effectively represents a bar code or the international standard recording code (ISRC), a specific identification number DIN-31-621. These blocks Q-subchannel does not contain a lot of positioning data, and therefore, they are not as useful for positioning on the drive. They are located on periodic, but rather large intervals in the Q-subchannel, so as not to contradict the requirements of the positioning of the CD-ROM.

It is impossible to detect errors on the CD-ROM by reading the data sector, because of the extensive procedure of the error correction guarantee that the data sector are always correct. However, there is no error correction, applicable to 0-subchannel. Moreover, since Q is the sub-channel is used to provide positioning information, it can be read is known by the reader CD-ROM drive. This means that for reading data error drive not require specialized hardware, and then to retrieve the error information may be used a known treatment method.

When the method is accordance with the present invention, the laser sensor is moved to a position on the CD-ROM. In response to the read command Q-subchannel reads the block Q-subchannel that has just passed under the laser sensor. This process is sequentially repeated until then, until all the blocks of the Q-subchannel on the CD-ROM will not read.

Because the entire disk is read sequentially, any skipping blocks Q-subchannel can be identified and listed. It blocks Q-subchannel include corrupted data. They can be detected by comparing the control cyclic redundant code (CRC), recorded at the end of the unit, with the control cyclic redundant code (CRC), calculated by the drive. If the control loop is redundant codes are the same, then the block Q-subchannel listed as distorted and hence is skipped.

As explained above, the list of missed blocks will be unique for each drive, while the set of disks from the same matrix, for example, will have a total error. Figure 5 schematically depicts the CD-ROM 6, having a number of errors E, which are distorted blocks Q-subchannel. The location of the error E is added to the list, as described below, to generate a list of errors, L.

Figure 6 shows a variant embodiment of the device, dedicated to superior quality products is obtained to determine the origin of the CD-ROM. This unit contains a reading device 21 CD, coupled with a means 22 of the processing. The tool 22 processing interconnected with the storage device 23 of the data, and also has a display 24, which may be used to visually display information about the process of determining origin.

As explained above, the test disk 6 is inserted into the reading device 21 CD-ROM and is read sequentially under the control of the microprocessor 22. Control cyclic redundant code (CRC) of each block Q-subchannel is checked at block content, then the microprocessor 22 stores or displays a list L of blocks Q-subchannel that do not have reliable control cyclic redundant check (CRC). To determine the origin of the CD-ROM could be used only a list of corrupted or missing blocks. Additionally, if you want, blocks Q-subchannel, which contain UPC/EAN or ISRC, are detected and recorded in a storage device or displayed by the microprocessor 22.

Also, if required, the microprocessor 22 can calculate a checksum of the data on the CD-ROM, and save or display the calculated value.

Additionally or alternatively, control flags errors from decoders C1 and C2. This allows to retrieve the list s the Directors and the provisions in sectors which decoders errors were detected. The C1 and C2 decoders can correct these errors as well as error detection, and this fact, together with information about how the decoder has detected an error and what the decoder has fixed the bug, if it really was fixed, can also be extracted. With the help of all these funds, the microprocessor 22 extracts from the CD-ROM the information about the errors that you want to use to determine its origin. Then, this error information is compared with the characteristic error information.

To obtain characteristic information about the error in order to compare the disks from the same batch are read using the device shown in Fig.6, in order to extract the same information about the error, as described above. In this case, the disk group, all of which have been read, will be all produced from the same master disk or matrix, provided that all of the disks in this group will have errors caused by "fingerprints" of this master disk or matrix. Data from all disks in the group are compared to identify information about the errors that are common to each disk. Then the characteristic list, error information can be generated and stored or displayed by the microprocessor 22. Then the information is b errors extracted from the test drive, can be compared with the characteristic list, and through this comparison, you can determine that they have received the disk from the same group as the disks used to create the characteristic list.

Perhaps it would be easier to verify that the test disk has any errors characteristic list. However, it is preferable to correlate the data with the test drive and the characteristic error information to calculate the degree of their conformity. This can be done by cross-referencing the two sets of data, identifying common features, and then executing calculations using statistical methods of probability characteristics in common, occurring purely by chance. You can calculate the probability that the disks come from different manufacturers. Some probability is taken as the threshold above which the hypothesis would be accepted.

Used statistical method may be selected on demand. Currently preferred are Bayesian statistical methods.

When the characteristic data list error was received and saved to a disk group, then you can consistently verify the number of disks according to the saved list. The process can be accelerated pose the CTB use a saved list to identify when testing those parts of the disk on which you would expect errors, and then read only those sections of the test drive, not to read sequentially the whole disk.

It is possible to make the glass master disk with known missing blocks Q-subchannel, through the intentional distortion of the cyclic redundancy code of some blocks of the Q-subchannel in known positions. In this way, the provisions of intentional skip blocks Q-subchannel will be known before you made the glass master disk drive and the data will be written. If the glass master disk is manufactured using such a process, then you can check that the disc is legitimate, by seeking to identify the disk is known, missed blocks Q-subchannel. If any of the blocks, which is missing, is actually present, then you can conclude that the CD is a fake, and if required, this information could be used to stop the disk usage. On the contrary, if the blocks are assumed to be missing, omitted, then it is concluded that the disk is genuine and can normally be used.

7 depicts a device for recording on a master disk known identificat the ion error information, such as a well-known characteristic missed block Q-subchannel. The device shown in Fig.7, is very similar to the known device for the manufacture of the master disk. The device has means 34 of the handle containing the memory management system. In particular, the processor 34 controls the laser 32, intended for recording information on the disk 20. The means 37 for storing data, which will store the data that must be encoded on the disc 20, is connected to the microprocessor 34, and, thus, the data held in the circuit 33, the signal encoding in which data is then encoded by the modulation signal intensity of the laser. This signal is supplied to the laser 32, which generates laser light with a desired modulation. The radiation passes through the laser focusing optics 31, which focuses the laser light onto the corresponding areas of the disk 20.

The tool 34 processing controls the positioning of the focusing optics 31 using servo 35 of the recording head. Also means 34 of the handle controls the speed of rotation of the disk 20 by the controller 36 of the spindle, which controls the speed of rotation of the spindle on which is mounted the disk 20.

To add identification information about the errors in the master disk and all his party copies with h the th, you only need to provide the means 37 for storing data required credentials error. Identification data error is forced to change the user data stream encoded in the modulation signal intensity of the laser, so as to introduce elements identified in the identification data error. In those cases where drive is the glass master disk, all matrices and disks that are physically produced from it, will have the same identification data error. If then this CD to be tested according to the method of the present invention to identify its origin, it will produce error information, which is strictly correlated with the identification error data recorded on the master disk in the manufacture.

In cases where identification error information is added to the master disk, as described above, are intentional distortion blocks Q-subchannel, then for a list of missing blocks Q-subchannel common to group, group can serve legitimate disks. Then you only need to test each test drive to see whether it has the block Q-subchannel in those parts in which legitimate disks have missed blocks Q-subchannel. Unit identification, which pre is supposed missed, shows that the CD is a fake.

It should be clear that under this description can be made variations and modifications of the present invention.

1. The way to determine the origin of the disk carrier data, and data on said disk have errors that are hereditary are the result of the physical manufacturing process, the data is usually read from the above-mentioned disk using the standard read process to correct the above errors, containing the steps: read the data from the above-mentioned disk in raw form from the raw data retrieve information about errors in the data on said disk; provide characteristic information about the errors and compare the extracted error information and the characteristic information about the error; and referred to the characteristic error information is characteristic of all drives-media data, when the discs are made known source, whereby the above-mentioned phase comparison determines whether the above mentioned disk is made known source.

2. The method according to claim 1 in which the said disk is identified as genuine, when error information is retrieved from disk, correlates with the characteristic information about the error is C known and legitimate source.

3. The method according to claim 1 in which the said disk is identified as a counterfeit of the master disk in the absence of correlation between the error information and the characteristic information about the error.

4. The method according to any one of claims 1 to 3, further comprising stages: read the characteristic information about the error, which compares the extracted error information with known and genuine disk, and then perform the correlation between the extracted error information and the extracted characteristic information about the errors with known and genuine drive to determine the probability that the test drive is a fake.

5. The method according to claim 4, in which the characteristic error information read with the famous and original disk in real time.

6. The method according to any one of claims 1 to 3, further comprising stages: get the characteristic error information from multiple disks, each disk of the mentioned sets are made the same known source and extract and store information about errors that are common to each disk of the above sets, to provide characteristic information about the errors, with which compare the errors of the test disk.

7. The method according to any of the preceding claims 1 to 6, in which the mentioned standard about the ECC read for the standard reading data from disk and error correction, includes different stages or levels of reading, processing, correction and encoding, the method further comprises the steps of reading unadjusted information from the disk by obtaining data from any of the stages or levels of data produced during the mentioned standard reading process.

8. The method according to any one of claims 1 to 6, in which the mentioned standard, the reading process is standard for reading data from disk and error correction modify to extract the unadjusted information from disk.

9. The method according to claim 7 or 8, further containing the step of extracting error information from the disk of the positioning data read from the disc by means of the mentioned standard reading process.

10. The method according to claim 9, in which the disc is a CD-ROM, and the above-mentioned standard process reads and processes the data block Q-subchannel from a CD-ROM, the method further comprises the step of reading the data blocks of the Q-subchannel to ensure the possibility of extracting information about the error.

11. The method according to claim 10, further comprising stages: reads the blocks of the Q-subchannel CD and determine which blocks of the Q-subchannel were distorted or omitted to generate the list of corrupted or missing blocks, and compare the list distorted the s or missed blocks with characteristic list of corrupted or missing blocks.

12. Device to enable determination of the origin of the disk carrier data, and data on said disk have errors that hereditary appear in the physical production process, this data is typically read from the disk using the standard read process to correct the above errors, the said device comprises a reading device for a drive designed to read data in the incorrect form with the said disk, and means of processing that is designed to retrieve information about the error of the uncorrected data from the disk, and the said processing means has a characteristic error information and is intended for comparison of the extracted error information and the characteristic information error, in fact the characteristic error information describes the disk-storage device, which is made known source, the said processing means compares the extracted error information and the characteristic information about the error to determine is made whether the disk is a storage medium known source.

13. The device according to item 12, further containing a means to identify whether the disk storage medium is authentic, and when the involved information about the error from disk correlates with the characteristic error information from well-known and legitimate source.

14. The device according to item 12 or 13, further containing a means for storing the characteristic error information from a variety of known sources.

15. Device according to any one of p-14, optionally containing extraction tool designed to read the characteristic error information from a disk of known origin, and the said processing means is for comparing the extracted mentioned error information from a disk with a characteristic error information, which is provided by the means of retrieval.

16. Device to enable determination of the origin of the disk-media data, where the data on said disk have errors that hereditary appear in the physical production process, this data is typically read from the disk using the standard read process to correct the above errors, the said device comprises a reading device for a drive designed to read blocks of data from the above-mentioned disk in the incorrect form, the process for identifying and compiling a list of data blocks that have been distorted or ignored, storage means for storing characteristic list of corrupted or missing blocks Yes the data which characterizes the disks are made from a known source, and means for comparing the identified list with the stored characteristic list to determine is made whether the disk mentioned known source.

17. The device according to clause 16, in which the reader for disks intended for reading data blocks positioning so that the blocks positioning data that have been distorted or ignored, would be made in the list and compared with the characteristic list of corrupted or missing data blocks positioning.

18. The device according to 17, in which the disc is the CD-ROM referred the reader to disks intended for reading blocks of the Q-subchannel to retrieve information about the error.

19. Device according to any one of p-18, in which the said device has a storage means for storing a set of characteristic lists received from the groups of disks are genuine, and the said processing means is for comparing the identified list with all of the characteristic list, whereby is determined whether the test disc is authentic.

20. The method of implementation identifying information about the errors in the disk storage device in which the disk-physical data carrier is Ki made, either directly or indirectly from the master disk, the master disk is manufactured through a manufacturing process that is controlled by the processing means, the method containing the steps of filing identification data error in the processing and implementation of identification data error in the data that are stamped on the master disc during its formation to provide identification information about the errors on the disk, made with the master disk, and the identification data errors are errors that occur during the physical process of manufacturing the disk-storage device, and can be read and identified by standard reading process.

21. The method according to claim 20, further comprises the steps of obtaining error information from each of the multiple disk drives-media data, each of the said multiple disk-storage media made the same known source, and errors in each of the disks appear inherited from the physical process of extracting information about the errors that are common to each disk of the above sets, the extracted error information as the characteristic information about the error, which characterizes the drive that made the known source, and use characteristics the static error information as the identification information about the error.



 

Same patents:

FIELD: optical data carriers.

SUBSTANCE: at least one free area is determined in position, following noted data area of user. Said free area is distributed in backward order from the last element of noted area. When replacing damaged elements of user data it is used from last elements of said free data area.

EFFECT: higher efficiency.

2 cl, 7 dwg

The invention relates to the field of optical recording media, and in particular to methods of defect management, implemented by the equipment to record and/or playback

The invention relates to the distribution of free areas to control the damage on the media drive, the method of manufacturing and a drive controller

The invention relates to the field of management defects when recording or playing back video and/or audio data using a digital versatile disk random access (DVD-RAM)

The invention relates to a recording and reproducing device with an optical disk for recording data on an optical disk and reproducing the data recorded on the optical disk to the recording device by the optical drive used exclusively for recording data on an optical disk reproducing device with an optical disk that is used exclusively for reproducing data recorded on an optical disc, and method of replacement for the implementation of the process of replacing the defective area or defective areas in the device with optical drive

The invention relates to the field of processing, storage and transmission of digital data with the possibility of detecting and correcting errors

FIELD: data carriers.

SUBSTANCE: in response to control reading signal received at amplifier input, on output of this amplifier output signal is produced, signal is then formed, reflecting difference between output amplifier signal and support signal. First compensation signal is generated, absolute value of which is proportional to absolute temperature, and second compensation signal, absolute value of which does not depend on temperature during forming estimation signal first compensation signal is summed with signal, reflecting said difference, or is subtracted from it dependently on second compensation signal.

EFFECT: higher precision.

4 cl, 7 dwg

FIELD: copy protection.

SUBSTANCE: control data are encoded on a CD. Copy protection method includes stage of playback of selected control data incorrectly and/or non-precisely. Said control data are inaccessible or not readable at all by sound player, which only can play sound data. Wrong control data make sound data absolutely not readable by data reading device. Copy-protected CD with digital sound record contains audio data and control data, encoded in above-mentioned way.

EFFECT: higher efficiency.

2 cl, 7 dwg

FIELD: digital data storage devices.

SUBSTANCE: device is provided with memory area for storing data and separate microprocessor, having a communication interface, memory block and processor connected to communication interface, and also to memory block. Data may include first data portion, which is adapted for reading and decoding by a computer device, in case when at least one condition is fulfilled. Microprocessor is adapted for generation of at least one cryptographic key. Processor is made with possible realization of communication to computer device through communication interface for checking whether said condition is fulfilled, and for generation of said cryptographic key for mentioned computer device, if the condition is fulfilled. Also provided are computer device for communication with computer-readable carrier; method for reading and decoding data from computer-readable carrier; data carrier, computer software for realization by a processor of method for reading and decoding data from computer-readable data carrier; method for allowing access to data, stored on a computer-readable carrier; data carrier, provided with software for realizing method for allowing access to data, stored on computer-readable carrier; method for allowing access to data, stored on computer-readable carrier and system for providing for safe access to data.

EFFECT: reliable copy protection.

10 cl, 6 dwg

FIELD: data signals.

SUBSTANCE: method and device are used for extraction of additional data from data signal containing at least first z1 and second z2 channels, while each of which has similar selections w of additional data, inserted into given positions of signal selection. Method includes comparison 62 of first series of given selections of signal of first channel, separated by given number M of signal selections, to appropriate second series of selections from second channel signal and displacement 65 of first and second series for one selection position and comparison operation for first and second series is repeated until series become similar again.

EFFECT: higher efficiency.

2 cl, 6 dwg

FIELD: data carriers.

SUBSTANCE: data carrier has formatted information for data and manufacturer information, containing identification information for recording device, which forms or modifies data on data carrier, and normalizes information, related to modification of data on carrier. Manufacturer information has individual format, incompatible to other manufacturers.

EFFECT: higher efficiency.

7 cl, 8 dwg

FIELD: technologies for authentication of information.

SUBSTANCE: method includes performing absolute identification for confirming legality of data carrier according to first rule in preset time. Authentication information is recorded on this data carrier in previously set position. Process of arbitrary authentication is performed for confirming legality of said data carrier in accordance to second rule in arbitrary time. First rule includes announcing confirmation of standard match, if information for authentication is detected as registered in selected preset position. Second rule in given arbitrary authentication process includes announcing standard match, if information for authentication is detected as not registered in arbitrary positions, different from given preset position.

EFFECT: higher reliability.

6 cl, 12 dwg

FIELD: optical data carriers.

SUBSTANCE: at least one free area is determined in position, following noted data area of user. Said free area is distributed in backward order from the last element of noted area. When replacing damaged elements of user data it is used from last elements of said free data area.

EFFECT: higher efficiency.

2 cl, 7 dwg

FIELD: optical data carriers.

SUBSTANCE: at least one free area is determined in position, following noted data area of user. Said free area is distributed in backward order from the last element of noted area. When replacing damaged elements of user data it is used from last elements of said free data area.

EFFECT: higher efficiency.

2 cl, 7 dwg

FIELD: optical data carriers.

SUBSTANCE: for protecting optical disk from recording, information concerning protection from recording is read, which is previously recorded in at least one zone of starting or ending area of data carrier, and it is determined, whether the latter is in state of recording protection. In variant, when carrier is placed in cassette body, and body has aperture for forbidding recording protection of data on disk, it is determined, if recording protection state of recording protection data written on disk is matches with state of recording protection of said aperture, and recording of new data is prevented, if said protection data and aperture position forbid recording. In a variant information concerning recording protection is stored in zones of disk identification of at least one of zones of starting and ending area of carrier.

EFFECT: higher efficiency.

5 cl, 16 dwg

The invention relates to a method of recording, the control method and device for recording

FIELD: optical data carriers.

SUBSTANCE: for protecting optical disk from recording, information concerning protection from recording is read, which is previously recorded in at least one zone of starting or ending area of data carrier, and it is determined, whether the latter is in state of recording protection. In variant, when carrier is placed in cassette body, and body has aperture for forbidding recording protection of data on disk, it is determined, if recording protection state of recording protection data written on disk is matches with state of recording protection of said aperture, and recording of new data is prevented, if said protection data and aperture position forbid recording. In a variant information concerning recording protection is stored in zones of disk identification of at least one of zones of starting and ending area of carrier.

EFFECT: higher efficiency.

5 cl, 16 dwg

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