MXPA00005510A - System for copy protection of recorded information - Google Patents

Abstract

An information carrier, e.g. an optical disc, comprises information arranged according to a recording format. The information includes format information indicative of parameters of the recording format such as start and stop addresses of user information. The information is recorded according to predefined encoding rules, which correspond to rules of a different recording format, e.g. CD-ROM or DVD, that prescribes a predefined location (12) on the information carrier for recording the format information. However the predefined location (12) comprises a confusion pattern (CON) and the format information is recorded at a second location (CPS1) different from the predefined location. A non-compliant player is unable to read or copy the information carrier because the reading is disturbed by the wrong parameters of the recording format. According to the invention a recorder is arranged for recording said confusion pattern and relocating said format information, whereas a player is arranged to retrieve the relocated format information.

Description

SYSTEM FOR PROTECTION AGAINST COPY OF REGISTERED INFORMATION The invention relates to an information carrier comprising information arranged according to a registration format, the information being recorded according to predefined coding rules and including an information format, indicative of the parameters of the registration format. The invention also relates to a player for reproducing the information of the information carrier, the player comprises formatting means, to provide the parameters of the registration format, and reading means to retrieve the information, depending on the parameters of the register format. The invention also relates to a recorder for recording information arranged according to a registration format on an information carrier, the registrar comprises recording means for recording the information according to predefined coding rules, and for including a format of information indicative of the parameters of the registration form. The invention also relates to a method for recording information arranged according to a registration format on a carrier of the information, method in which, the information is recorded according to predefined coding rules, and the format of the Information is included, indicative of the parameters of the registration form. A system for protection against copying of the registered information comprises an information carrier, a player and a registrar, as is known from patent US 5737286 (DI from the list of relevant documents). Copy protection may include preventing the creation of a digital copy on a different carrier, allowing some copying activity (for example, only a first generation of copies), or controlling, verifying or restricting access to protected information. The information bearer comprises information recorded in accordance with an existing record format, for example, a CD-ROM format. The format prescribes the structure of the recorded information, such as what type of information is recorded at which location on the disk, for example, that the registered area begins with an entry area at a predetermined diameter. Such a format may also include other parameters, such as the type of registration layer (recordable, pre-registered, etc.), a number of registration layers and physical parameters of the registration process (density, reflectivity, etc.). The format of the information, which gives the actual values of the parameters of the record format used in a carrier of information in question, is included in the recorded information about the record carrier, and is intended to be used by the player, when reproduce the information of the user of the information carrier, for example, the parameters of the format in the headers of the sector or a Matter Index (TOC), which includes information about where the user's information begins and ends. The information in the bearer of the information is recorded according to predefined coding rules, such as the channel code (EFM) for translating the user bytes into optically readable depression lengths in the CD, and error coding rules and structuring of the sectors. Such coding rules are usually a predefined part of the record format, and are not indicated in the format information recorded on the disk. The player for reproducing the information carrier comprises reading means, for reading and decoding the recorded information according to the inverse of the coding rules. In the DI system, the player and the information carrier form a system for the reproduction of controlled information, in which the reproduction of illegally copied information is counteracted. Copy protection has a long history in audio or video publishing. The equipment base currently installedIn particular, Personal Computers (PC), with audio / video cards, provide little protection against unauthorized copying. In any copy protection scheme, the most difficult point is that a pirate can always try to play an original disc, treat the content as if it were a domestic analog record, and register it. However, the best quality is only available when a digital copy can be made. For digital storage media, such as the Digital Compact Camera (DCC), the "copy bits" have been defined, bits which indicate a state of copyright, for example "copy not allowed", "free copy" , or "a generation of copies allowed". Other bits of copy may indicate that the medium that stores the information must be a "professional" medium, manufactured by pressing, and not a "recordable" disc. However, such copy bits can be easily ignored by the pirate, for example, using a PC as a copying machine. Devices, which do not obey the rules of a format, are called "illegal" devices. The protection against copy of the system known as DI, is based on a so-called mark of the medium, that is, a physical mark that represents a pattern of bits that indicate the state of copyright of the medium, for example, a "professional" disc manufactured by pressing. The mark of the medium itself, can not be copied or changed by standard recording equipment, and the bit pattern will be verified by the legal player and may even be required for reproduction, for example, a sorting code to retrieve the information stored as disordered information. In the DI record carrier, the information is recorded in the track in a predefined manner, represented by optically readable patterns, formed by a variation of a first physical parameter, such as the height of the scanned surface. The middle mark is constituted by variations of a second parameter of the track, which is modulated according to the bit pattern, for example, an excursion in a cross direction of the track formed by a pre-race, also denoted as a oscillation or eccentric rotation. If the information of the known record carrier is copied "bit by bit" by a pirate, in a writable information carrier using an illegal device, the information in this copy can not be reproduced by a legal player, because the copy does not includes the mark of the medium that corresponds to the information copied illegally. However, the detection of the mark of the medium and the recovery of the bit pattern requires additional elements, in the legal reproducer, whereas a legal registrar of preference, also detects any mark in the medium in a recordable disc. Therefore, the known system for copy protection requires expensive and complex players and recorders. An object of the invention is to provide a system, in which access and copying of recorded information is controlled and which is less complex. For this purpose, the bearer of the information as described in the opening paragraph is characterized in that, while the coding rules corresponding to the rules of a different record format prescribing a predefined location of the information bearer, to record the format information, the predefined location comprises a confusion pattern and in which the format information is recorded in a second location, different from the predefined location. The player, as described in the opening paragraph, is characterized in that the means of the format are arranged to detect the record format of the information carrier, and in which the means of the format are arranged to supply predefined parameters or to retrieve the information. of the second location format, when the registration format is detected. Registered as described in the opening paragraph, characterized in that the recording means are arranged to register a confusion pattern in the predefined location and to register the format information in a second location, different from the predefined location. Existing illegal reading devices will try to read the format information from the predefined location, but instead, will read the confusion pattern. This pattern of confusion will cause existing devices to stop reading, or use incorrect settings for reading media, which causes the reading process to not work well. This has the effect that the existing devices are prevented from accessing the audio / video information protected against copying, from the carrier of the information, because they can not read the format information. Therefore, a digital copy can not be made using illegal recorders or players, even when they have not detected (or manipulated or not taken into account) any bit of copy protection information. Although the format information is hidden for existing players, it can be easily recovered by the player according to the invention. This has the advantage that the reading means, although comprising complex error correction and decoding circuits, can be manufactured relatively cheaply, because all the components are substantially common to the existing players.

The invention is based on the recognition that the information of the format must be available, but can not be manipulated in the illegal devices. By relocating the format information, the uncontrolled reproduction of copy protected discs by illegal, existing devices can be avoided. In particular, the reading and / or recording of format information can not be controlled or manipulated by a pirate, because such steps are usually constructed in a control unit in the basic reading or writing device. As an alternative to relocate format information, it would be possible to change the predefined encoding rules of an existing registration system, for purposes of copy protection. This, however, increases the cost of a new copy-protected registration system, because complex ICs must be redesigned and produced specifically for new registrars and players. Therefore, in practice, the coding rules should be the same as the coding rules of an existing system, for example the Compact Disc (CDD) or the Digital Versatile Disk (DVD) system, and the illegal devices that comprise such encoding and decoding means are available. A registered record carrier with the encoding rules can be reproduced on an illegal device, for example on the PC, and manipulation of the audio / video information would be possible. However, by relocating the information of the format according to the invention, illegal reproducers are prevented from reproducing in an uncontrolled manner, because they are based on the information of the format, such as the TOC on a CD or the Physical Format information. , on a DVD, to have access to the audio / video information. A preferred embodiment of the system is characterized in that the second location is selected in a variable manner within a predefined area of the information carrier and / or in which the information of the format located in the second location is encoded, using a decoding key. Variably selected means that when the audio / video production is put on a master disk for mass reproduction, a second specific location for that production is randomly selected from the range of possible locations. Alternatively or in combination, a coding key is generated randomly for each new production. This has the advantage that it is more difficult for a pirate to locate and retrieve the correct format information. The additional advantages, the preferred embodiments according to the invention are given in the dependent claims.

These and other aspects of the invention will be apparent from, and further elucidated with reference to the embodiments described by way of example in the following description and with reference to the accompanying drawings, in which Figure 1 shows a record carrier , Figure 2 shows a structure of the logical sector, Figure 3 shows a map of the control information of an existing format, Figure 4 shows the format information in a predefined structure, Figure 5 shows a confusion pattern, the Figure 6 shows a map of the control information, including the control information of the copy, .. Figure 7 shows the data of the disc format; Figure 8 shows the key information, Figure 9 shows a reproducing apparatus, Figure 10 shows a recording device, Figure 11 shows a coding process; and Figure 12 shows a decoding process. The corresponding elements in the different Figures have identical numerical references. The Figure shows a disc-shaped information carrier 11 having a track 19 and a central hole 10. Track 9 is arranged according to a spiral pattern of turns, which constitute substantially parallel clues in an information layer. The information carrier may be an optical record carrier, for example, an optical disk, having an information layer of a recordable type or a pre-registered type. It is intended that the record carrier carries "user information, eg, audio or video or computer programs." Examples of recordable discs are CD-R and CD-RW, and DVD-RAM, where the audio CD is an example of a pre-registered disk, the pre-registered type can be manufactured in a well-known way, first registering a production of an audio and video content on a master disc and subsequently pressing the consumer discs. The record carrier is indicated by a pre-stamped track structure provided during the manufacture of the blank record carrier The track structure is constituted, for example, by a pre-slot 14, which allows a read / write head to follow the track 19 during the scan The information is represented in the information layer by optically detectable marks, recorded along the track, for example, depression It is and flat surfaces. Figure Ib is a cross-section taken along the line bb of the record carrier 11 of the pre-recordable type, in which a transparent substrate 15 with a recording layer 16 and a protective layer 17 is provided. The pre-bead 14 can be implemented as an indentation or elevation, or as a property of the material that deviates from its surroundings. The record carrier comprises recorded information according to a registration format. The record format prescribes the way in which information is recorded, encoded and mapped logically. The way of recording the information in the format includes parameters of the recorded information, for example, the type and number of registration layers, speed of the data, etc. In addition, the format includes coding rules, such as channel coding rules, error coding or sector structuring. An example of a sector structure is given in Figure 2. The encoding rules of the information carrier, according to the invention, corresponds to the known coding rules, such as the CD or DVD format. Logical mapping can include the subdivision of the recordable area into a user data entry area and an output area, and control information to retrieve user information, such as the Matter Index or a filing system, for example, ISO 9660 for CD-ROM. Figures 3 and 4 show examples of such control information, in which it is plotted on maps at a predefined location on the record carrier, usually at or directly after the entry area. Some format parameters may vary for different information carriers, and for that reason, the format information that gives the actual values of such parameters is recorded in the information carrier. The coding rules are necessarily a predefined part of the format, because they have to be known in advance to read and decode any information, and therefore, the coding rules are usually not included in the format information. The format information is recorded at a predetermined location 12 on the record carrier, because all players need to retrieve the format information before more information can be read. Figure 2 shows a logical sector structure, as an example of a predefined encoding rule. The first part 51,51,53, constitutes a heading. The first 4 bytes 52 constitute the Identification Data (ID), for example, the information of the sector number and the type of sector. The next 2 bytes 52 are for Error ID Detection (IED), and the 6 bytes 53 are Reserved (RSV) for additional use, which may include copy protection status bits. After the header, there are 12 rows of 54 main data (the first row is 160 bytes, then ten rows of 172 bytes and the last row of 168 bytes, 2048 bytes in total). At the end, an Error Detection Code (EDC) 55 of 4 bytes is added. Figure 3 shows a schematic map of the control information in the first part of the registered area of an information carrier according to an existing format. Usually, the optical information carriers are mapped logically and recorded / read in an outward direction, starting at a predefined diameter on the inner side of the track pattern 13. The first section of the map contains information of the format, called Information of the Physical Format (PFI), and constitutes the predetermined location 12. The second section 58 comprises the Disk Manufacturing Information (DMI), and the third section 59 comprises the Content Provider Information, which is additional information about the data of the user, for example, audio / video production information, registered in the user information area. This control information can be recorded repeatedly, for protection against reading errors and dust or scratches. The map given in Figure 3 is an example, since a control information structure may comprise other elements or may have a different constitution, but according to the existing format, the control information structure must comprise at least some information of the format in some predefined location 12. Figure 4 shows information of the format in a predefined structure. The structure and type of parameters included are predetermined in the format, since all the reproduction or recording devices must be able to recover the value of the parameters to control the reading and / or recording means. The first parameter gives the Disk Category and the Version (DVD), for example, read only and according to the specification, version number 1. Next, the next parameter gives the Disk Size and the Transfer Rate (DSR) ). The third parameter gives the Disk Structure (DS), for example, the number of layers and the layout of the tracks. The fourth parameter gives the Registration Density (RD), and the fifth parameter the Data Zone (DZ), for example, the address of the first and last physical sectors of the user's data area. The additional bytes 16, 17-31 and 32-2047 are reserved (RSV) for additional use. The carrier of the information according to the invention complies with the coding rules of an existing format, but the format information is relocated from the predefined location to a different location. The different location may be somewhere else within a map corresponding to Figure 3, for example, in the CPI area 59, as shown in Figure 6, or in the bytes of the reserved area 16-2047, as shown in Figure 4. The predetermined location 12 comprises a confusion pattern, which gives erroneous values to the parameters of the format. A device to reproduce information carriers of the existing format, a so-called illegal device, will read the confusion pattern, and the reading of additional information will be avoided, because the wrong format parameters cause erroneous adjustments in the illegal device or the process reading is aborted by the illegal device control program. In an embodiment of the information carrier according to the invention, the format information comprises the information of the user's key to process the user's information. As the user information is relocated, as indicated above, and because the user's key information is required to process the user's information, a pirated player can not completely recover the user's information, even if it manages to read the information of the user's area. The processing may comprise decoding from the user's audio or video information, until access to control of certain options within the computer program, or verification or transfer of a state of control against copying. In a modality, only a part of the user's information is encoded. For example, decoding is required only for some sectors of the user information area, as indicated by a bit in the reserved bytes (RSV) 53 in the structure of the sector shown in Figure 2. When only one sector is encoded from very few (eg, 2 to 10), this has the advantage that less time is required for decoding and less computing power is required in the player. In a further embodiment, the user's key information is used to verify and control the copyright status of the user's information, and / or to verify a watermark included in the user's information. Such information of the user's key, also called control ticket, is described in D3. The control ticket is used to transfer the status information of copies and to control the generation of copies in a legal recorder and / or player, as described in D3. Alternatively, the control ticket can be encoded using the user's key information and stored in a different location on the information carrier. Figure 5 shows a confusion diagram in the same structure as the format information of the existing format as shown in Figure 4. The confusion pattern (CON), covers bytes 0 to 15, which are used in the existing structure of the Figure. The confusion pattern can be a random pattern of all zeros or one. In one mode of the information carrier, the confusion pattern comprises false address information in the bytes of the Data Zone of the existing structure. The false address information is indicative of a different area of the user's information area, for example, a very small area within the entry area or a very large area outside the physical boundaries of the record carrier. In a form of the record carrier, the false address information is indicative of an area comprising the recorded information according to the existing record format. The confusion pattern in this modality comprises valid information, which, however, only covers a part of the disk, which is fully registered according to the existing format, forming a combination disk. The part according to the existing format may contain a warning message, or alternatively, a different representation or selection (a preview) of the information in the "copy protected" area, registered according to the format of the invention. Preferably, the "copy protected" area does not immediately follow the area of the existing format, since some actuators may ignore the control information and continue playing. Some infill information or an unregistered area could be located between the two areas. Figure 6 shows a schematic map of the control information that includes copy control information. The predefined location 12 comprises the confusion pattern WITH instead of the PFI format information. Next, corresponding to the existing format shown in Figure 3, the DMI section 58 and the section CPI 59, section CPI which comprises at least one location of the Copy Protection System (CPS), to record the system information of protection against copying, for example, the information of the relocated format. In the Figure, section CPI 59, is subdivided into parts X, Y, and Z, by a first section 61 of the Copy Protection System (CPSI), and a second section 62 of the Copy Protection System (CPS2). The CPSI and / or CPS2, comprises the format information. In an embodiment of the information carrier, the CPS location is variably selected within a defined area of the information carrier. In Figure 6, the predefined area is constituted by the CPI area, but any area can be assigned for this purpose in the format according to the invention. The size of the X, Y and Z parts varies with the selected CPS location, and may even be zero.

In one embodiment, the information carrier comprises access information. The access information is indicative of the CPS location of the format information. An indicator of the CPS location can be included in the confusion pattern or the reserved bytes 16-2047, in Figure 4, following the bytes assigned to the parameters of the existing format. In one embodiment, the access information includes information from the Copy Protection System (CPSI) index, which indicates that the CPS locations are present and a confusion pattern is recorded in the predefined location. The CPSI comprises an indicator value for searching the information of the relocated format in the CPS locations, it is included in the six reserved bytes 53 in the sector structure shown in Figure 2. The CPSI registers in some predefined direction, for example, in some or all sectors of the entrance area. Such a value of the indicator may be an indicator relative to a sector number within the control data area shown in Figure 6. When several CPS locations are used, several indicators may also be used in the CPSI, or at a fixed distance between the locations CPS can be used, or additional indicators can be included in the first CPS location. Figure 7 shows the Disc Format Data (DFD), which is format information, as it is relocated to a Location of the Copy Protection System. The first 16 bytes of the DFD information can be structured as given in Figure 4. In a mode of the information carrier, the DFD information located in the second location is encoded using a decode key. The encryption key can be fixed and known for legal devices only. In one embodiment, the key information is recorded in a record carrier. Figure 8 shows the key information, as recorded in a CPS location. The information carrier comprises the key information for decoding the encoded DFD information. The first 0-m bytes comprise a Disc Format Key (DFK), and the following bytes m a n comprise an Encoded Initialization Vector E_IV. One embodiment of the coding and decoding process is described with Figures 11 and 12. Figure 9 shows a reproduction apparatus according to the invention, for reading a record carrier 11, record carrier which is identical to the carrier of register shown in Figure 1. The device is provided with drive means 21 for rotating the record carrier 1, and a read head 22 for scanning the track on the record carrier. The apparatus is provided with positioning means 25 for coarsely positioning the read head 22 in the radial direction of the track. The reading head comprises an optical system of a known type for generating a radiation beam 24 guided through the optical elements focused to a radiation point 23 in a track of the information layer of the record carrier. The radiation beam 24 is generated by a radiation source, for example a laser diode. The read head further comprises a focusing actuator for moving the focus of the radiation beam 24 along the optical axis of the beam and a tracking actuator for fine positioning of the point 23 in a radial direction at the center of the track . The tracking actuator may comprise coils for radially moving an optical element or may be arranged to change the angle of a reflective element. The radiation reflected by the information layer is detected by a detector of a conventional type, for example, a four quadrant diode, in the read head 22, to generate a read signal and the additional detector signals, including an error of tracking and a focus error signal, coupled to the tracking and focusing actuators. The read signal is processed by reading means 27 to recover the information depending on the parameters of the registration format. Reading media is a usual type, for example, comprising a channel decoder and an error corrector, which decodes the encoded read signal in accordance with the encoding rules prescribed by the format. The recovered data is passed to a data selection means 28. The data selection means selects the user data of all the read data and passes the user data to the data to the output unit 29, which may comprise a temporary memory or means of processing user data, such as the decompression of audio or video. The device is further provided with a control unit 20 for receiving commands from a user or a central computer for controlling the apparatus via the "control 26" lines, for example, a system collector, connected to the drive means. 21, the positioning means 25, the reading means 27 and the data selection means 28, and an output unit 29. For this purpose, the control unit 20 comprises control circuits, for example, a microprocessor, a program memory and control gates, for performing various procedures and functions, as described below.The control unit 20 can also be implemented as a state machine in logic circuits.The selection means 28 also retrieves the carrier control information of registration, which is passed in the control unit 20. The control information of the structure of the sector can be recovered by reading means 27, while decode the read signal, for example, the CPSI information described above. The control unit 20 comprises format means for providing the parameters of the registration format, retrieving the format information of the CPS location. The location of the CPS can be known by a legal device, and in that case, the format information can be read immediately. Alternatively, a set of parameter values may be predefined and stored in the control unit 20, and the values of the stored parameters are supplied when the format information is not retrievable from the predefined location. In one embodiment, the retriever comprises detection means for detecting the retrievability of the format information of the predefined location, detecting the confusion pattern and / or the access information. The control unit incorporates the detection means, which first read the predefined location, and based on the reading of the information, determines whether the carrier of the information is registered according to the existing format. If the information read is the confusion pattern, this is detected from the recognized erroneous values, for example, all zeros or an area too large for the user data. The record carrier may comprise access information, which explicitly explains the registration format according to the invention, such that a bit in the header of the sector (see Figure 2). In one embodiment, the detection means is arranged to read the access information, in particular, the indicator values or CPSI as described above. In a player mode, the format means are arranged to retrieve the format information of the CPS location, depending on the access information. In the event that the record carrier comprises information of encoded format, the format means are arranged to decode the format information. The decoding process is described below with reference to Figure 12. The information of the necessary key can be read from the information carrier and / or stored in the player. Figure 10 shows a recording device for writing information in a record carrier 11, according to the invention, of a type which is (re) writable. A similar recording device or method is used to produce a master disk for manufacturing pressed discs. During the write operation, the marks representing the information are formed in the record carrier. The marks can be in any optically readable form, for example, in the form of areas with a reflection coefficient different from their surroundings, obtained when registering in materials such as a dye, alloy or phase change material, or in the form of areas with a magnetization direction different from their surroundings, obtained when registering in a magneto-optical material. The writing and reading of the information to register on optical disks and rules of channel coding and error correction, formatting, useful, are well known in the art, for example, of the CD system. The marks can be formed by means of a point 23, generated in the recording layer via a beam of electromagnetic radiation 24, usually of a laser diode. The recording device comprises similar basic elements as the apparatus, for reading, described above with Figure 9, that is, a control unit 20, a driving means 21 and a positioning means 25, but has a writing head 39. The user information is presented in the input unit 36, which may comprise compression means for audio or video. Suitable compression means are described in D2. From the input unit 36, the data is passed to the data combining means 37, to add control data including the format information. The total data flow to be registered is passed to the writing means 38. The writing head 39 is coupled to the writing means 38, comprising for example, a formatting device, an error encoder and an encoder channel. The data presented at the input of the writing means 38 is distributed over the logical and physical sectors according to the coding rules and converted into a write signal for the writing head 39. The control unit 20 arranges to control the input unit 36, the data combining means 37 and the writing means 38, via the control lines 26 and to perform the positioning procedure as described above, for the reading apparatus. Usually, the recording apparatus will also be arranged for reading, having the characteristics of the reproduction apparatus and a combined writing / reading head. The registrar also comprises means for including the information of the format, indicative of the parameters of the registration form. According to the invention, the control unit 20 of the registration device is arranged to register a confusion pattern at a predefined location and to register the information of the format in a CPS location different from the predefined location. In further embodiments of the registration device, the unit 20 is arranged to record the format, access or key information as defined above for the record carrier, with reference to Figures 5 to 8 and as defined in the claims for the record carrier.

A registration method for the production of a record carrier is arranged to perform the functions of recording the registration, access or key information, as defined above for the registrar. Figure 11 shows a coding process.

The coding process is performed in a mode of the control unit 20 of the registered one shown in Figure 10. The coding is used to encode the format information to encoded DFD bytes, as discussed earlier with reference to Figures 7 and 8. Any suitable coding algorithm can be used, for example, as described in D4, in particular on page 390-392 in chapter 16.9, Additive Generators. Such an algorithm can be used to produce random words. The algorithm shown processes 4 bytes in a cycle. In a first step 71, an Encoded Initialization Vector (E_IV) is generated, using a key DFK and starts at a random IV number, added to a predefined constant C in the aggregation step 70. The resulting E_IV is recorded in the bearer register. The E_IV is added to the 0-3 byte of the information of the simple format in the aggregation step 72, and is processed in the coding step 73, using the values of the start key of the first step 71. Now, the bytes 0 -3 of the coded DFD, are available. This step is repeated 4 times until the last step 75, for the last bytes 12-15 of the DFD. The 16 bytes encoded DFD are recorded in the information carrier. Figure 12 shows a decoding process complementary to the coding process shown in Figure 11. The decoding process is performed in a mode of the control unit 20 of the player. In a first step 81, the E_IV is decoded using the DFK as the key information. The resulting IV is not used directly, but the decoding process is initialized for the next cycle. In the next cycle, in a next decoding step 83, bytes 0-3 of the encoded DFD are decoded and added to the E-IV in an aggregation step 82, to result in bytes 0-3 of the information of the simple format . The cycle is repeated until the last 12-15 bytes of encoded DFD, decoded in decode step 85 and added to the previous result in the aggregation step -84, to result in the 12-15 simple bytes, of the information of the format. Although the invention has been explained by modalities using audio or video, the invention can also be applied to computer data. In the embodiments, the record carrier is incorporated into an optical disk, but any other carrier can be used in the invention, such as a tape or broadcast, provided that the format information is supplied in the bearer corresponding to an existing format that prescribes a predefined way, which can not easily be manipulated. In addition, the invention is found in each and every one of the characteristics or combinations of novel features described above.

List of related documents (ID) US 5,737,298 (PHN 13922) Closed information system with physical copy protection (D2) WO 98/16014-A1 (PHN 16452) 1-bit ADC and lossless audio compression (D3) WO 98 / 33325-A2 (PHN 16372) Copy protection system based on a watermark and control ticket. (D4) Applied cryptography, by Bruce Schneider ISBN 0-471-12845-7

Claims (13)

1. CHAPTER CLAIMEDICATORÍO
2. Having described the invention, it is considered as a novelty and, therefore, what is contained in the following CLAIMS is claimed: 1. An information carrier comprising information arranged according to a registration format, the information being recorded in accordance with predefined coding rules, and including information of the format indicative of the parameters of the recording format, characterized in that, although the coding rules correspond to the rules of a different registration format, which prescribes a predefined location of the information carrier, for register the information of the format, the predefined location comprises a confusion pattern, and in that the information of the format is recorded in a second location different from the predefined location. The information carrier according to claim 1, characterized in that the second location is variably selected within a predetermined area of the information carrier.
3. 3. The information carrier according to claim 1 or 2, characterized in that the information carrier __ comprises access information indicative of the location of the format information.
4. The information carrier according to claim 1, 2 or 3, characterized in that the information of the format located in the second location, is encoded using an encoding key.
5. 5. The information carrier according to claim 4, characterized by the information carrier _ comprising a key information for decoding the encoded information.
6. 6. The information carrier according to any of claims 1 to 5, characterized in that the format information comprises an address information, indicative of a user information area, the confusion pattern comprises a false address information , indicative of a different area of the user information area.
7. The information carrier according to claim 6, characterized in that the false address information is indicative of an area comprising registered information according to the different registration format.
8. 8. The information carrier according to any of claims 1 to 7, characterized in that the format of the information comprises key information of the user, to process the information of the user.
9. 9. A player for reproducing information of the information carrier according to any of claims 1 to 8, the player comprises format means for providing parameters of the registration format, and reading means for recovering the information in dependence on the parameters of the registration format, characterized in that the formatting means are arranged to detect the information carrier registration format and in which the formatting means are arranged to supply predefined parameters or to retrieve the format information of the second location when the format is detected. formed of record.
10. The player according to claim 9, characterized in that the formatting means are arranged to detect the registration format by detecting the confusion pattern of the predetermined location and / or the access information.
11. The player according to claim 9 or 10, for reproducing information from the information carrier according to any of claims 3 to 8, characterized in that the formatting means are arranged to recover the format information of the second location, depending on the access information / or the key information.
12. 12. A registrar to record information, arranged according to a format in an information carrier, the registrar comprises recording means to record the information according to predefined coding rules, and to include the format information indicative of the registration format parameters, characterized in that, although the coding rules correspond to the rules of a different registration format, which prescribes a predefined location of the information carrier, to record the information of the format, the recording means are arranged to register a confusion pattern at the predefined location, and to register the format information at a second location different from the predefined location.
13. 13. A method for recording information arranged according to a registration format in an information carrier, method in which, the information is recorded according to predefined coding rules, and the information of the format is included, indicative of the parameters of the record format, characterized in that, although the coding rules correspond to the rules of a different record format, which prescribes a predefined location of the information carrier, to record the format information, the method comprises registering a confusion pattern in the predefined location, and register the format information in a second location different from the predefined location.