CN101278347A - Method and apparatus for writing and using keys for encrypting/decrypting a content and a recording medium storing keys written by the method - Google Patents
Method and apparatus for writing and using keys for encrypting/decrypting a content and a recording medium storing keys written by the method Download PDFInfo
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- CN101278347A CN101278347A CNA2005800426925A CN200580042692A CN101278347A CN 101278347 A CN101278347 A CN 101278347A CN A2005800426925 A CNA2005800426925 A CN A2005800426925A CN 200580042692 A CN200580042692 A CN 200580042692A CN 101278347 A CN101278347 A CN 101278347A
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Abstract
Content encryption information on content data recorded on a recording medium. A plurality of encryption keys is used for encrypting or decrypting a plurality of clip files containing content data in such a way that each of the plurality of encryption keys is used for encrypting or decrypting the whole or partial data of each of the plurality of clip files. The encrypting method in accordance with the present invention allows different titles to be encrypted with different encryption keys even in the case where some data segments are shared by multiple titles.
Description
Technical field
The present invention relates to a kind of write and use carry out the recording medium of the key that the method for key of copy protection and a kind of storage write by this method to being recorded in content on the recording medium.
Background technology
DVD-ROM, it is commonly called DVD, has the memory capacity of 4.7GB and is often used as the medium that high-quality digital contents such as film are provided.
Broadcast with analog-and digital-form simultaneously in the TV radio station at present, but will only utilize digital TV broadcasting in the near future.Digital broadcasting provides than the better video quality of its corresponding simulation part.Spectators wish to appreciate the film than the higher video quality of DVD naturally.
For this reason, have than DVD the more read-only and rewritable disk of high storage capacity develop.Higher-capacity disk can provide high-quality content to spectators in different and easy mode.
The copyright that is recorded in the content on recording medium such as the CD is invaded by bootlegging sometimes.In order to prevent bootlegging, with be recorded in that the special area that encrypted secret key is recorded in this recording medium (for example, Chang Gui read operation can not visit zone) is encrypted and will be used for to content-data on the recording medium or with key itself or the method that is used for obtaining this key be stored in the remote server of checking.
Under the situation of DVD, adopt a key that the data that are organized as title are encrypted and this key is written to the title of 16 bytes, it is added in each ECC (error correcting code) piece once in a while.
Can with a plurality of header records on single DVD and title data not with other title data overlaids.As a result, can adopt the different key that is used to strengthen copy protection that each title is encrypted.
But, under the situation of higher-capacity disk more, be recorded in title data on the dish can overlap each other and therefore do not allow with DVD in identical mode the content-data of record is wherein encrypted.
Summary of the invention
A kind ofly under the partly overlapping each other situation of title data, still allow to adopt different keys to carry out the data ciphering method of encrypt/decrypt even the purpose of this invention is to provide to being recorded in different title on the recording medium.
The present invention carries out encryption and decryption by optionally a plurality of encryption keys being applied to the whole or partial data of each data slot to the data fragment.
A plurality of encryption keys that the present invention will be used for encrypting a plurality of data slots are stored in key file, and will be used for making each index information relevant with utilizing this encryption key institute ciphered data section of these a plurality of encryption keys to be arranged in this key file or other management information files.
In one embodiment of the invention, each of a plurality of encryption keys is used to each data block is encrypted or deciphered, and described data block is to organize by using by a plurality of title data shared section boundaries in a plurality of data slots each to be divided.
In another embodiment of the present invention, each of a plurality of encryption keys is used in a plurality of data slots each encrypted or deciphered.
In another embodiment of the present invention, each of a plurality of encryption keys is used to being encrypted or deciphered by broadcast item each data segment pointed that is included in the title.
In one embodiment of the invention, index information is written in the clip information file that is used for storing the information relevant with each data slot.
In another embodiment of the present invention, index information is written in the key file that is used for the storage encryption key.
In one embodiment of the invention, each index information set comprises a pair of information and the data clip file name that is used to allow to visit this association key.
In another embodiment of the present invention, each index information set comprises a pair of association key and data clip file name.
In one embodiment of the invention, each data slot that belongs to each title is generated index information set.
In another embodiment of the present invention, each broadcast generation index information set to belonging to each title.
In one embodiment of the invention, obtain a plurality of encryption keys from the recording medium that wherein has content-data.
In another embodiment of the present invention, obtain a plurality of encryption keys by network from external server.
Description of drawings
The preferred embodiments of the present invention that comprised description of drawings that further understanding of the invention is provided, and, be used for explaining principle of the present invention in conjunction with this description.
In the accompanying drawings:
Fig. 1 shows the exemplary relationship between a plurality of titles and a plurality of data slot file;
Fig. 2 shows the block scheme of the device that is used to make the read-only recording medium with enciphered message according to an embodiment of the invention;
Fig. 3 shows the exemplary relationship between a plurality of titles and a plurality of data slot file, each data segment that wherein different encryption keys is applied to according to one embodiment of present invention being divided;
Fig. 4 shows the data structure that is used for storage encryption information according to embodiment shown in Figure 3;
Fig. 5 shows the exemplary relationship between a plurality of titles and a plurality of data slot file, each data segment that wherein different encryption keys is applied to according to another embodiment of the invention being divided;
Fig. 6 a and 6b show the data structure that is used for storage encryption information according to embodiment shown in Figure 5;
Fig. 7 shows the exemplary relationship between a plurality of titles and a plurality of data slot file, each data segment that wherein different encryption keys is applied to according to still a further embodiment being divided;
Fig. 8 a, 8b and 8c show the data structure that is used for storage encryption information according to embodiment shown in Figure 7; With
Fig. 9 shows the block scheme of the device of the recording medium that is used to reproduce storage encrypted content data and enciphered message according to an embodiment of the invention.
Embodiment
Higher-capacity disk media (for example, abbreviating the Blu-ray disc ROM of BD-ROM as) does not manage each clip file that comprises as the A/V data of title, and it is illustrated in Fig. 1.As shown in the figure, a movie playlist is managed as a title among the BD-ROM (the continuous playback unit information of logic), and comprising each play item and relate to entire segment file or clip file one section.Each section corresponding to this clip file of playing item can be overlapping.In Fig. 1, play item 11
2The data segment of reference and broadcast item 13
1The data segment of reference is overlapped.Similarly, play item 12
1The data segment of reference and broadcast item 13
2The data segment of reference is overlapped.As a result, title # 1 and title # 3 have overlay segment 10
1And title # 2 and title # 3 have overlay segment 10
2Title with overlay segment can not be encrypted with different keys.If two titles of shared this same section are encrypted with different keys, then this shared section should be decrypted with two different keys.For example, the overlay segment 10 of title # 1
1Should be with two different keys encrypted and therefore it should adopt two different keys decrypted twice.In other words, should be decrypted and the number of times of the number as much of the title of shared this section by the shared section of a plurality of titles, this has greatly weakened the decoding performance of transcriber.
In order to address this problem, the content-data of the title of shared this identical data section should be encrypted with identical key, it means that all titles shown in Figure 1 should be encrypted with this identical key, because shared data segment of title # 1 and title # 2 and title # 2 and the shared data segment of title #3.If in the high power capacity recording medium, can not encrypt different titles with different keys, the validity extreme difference of copy protection so.
For the present invention can be understood fully, its preferred embodiment is described referring now to accompanying drawing.
Fig. 2 is the block scheme that is used to make the device of the read-only optical disc with enciphered message according to of the present invention.This device comprises: the laser diode 10 that is used to produce laser beam; the collimator 11 that the laser beam that produces is collimated; (for example be used for according to modulating input signal; the EFM signal) optical modulator 13 of the parallel beam of autocollimator 11 is carried or closed to level; (for example be used for to concentrate on from the light beam of optical modulator 13 photographic layer that is positioned on the glass substrate; photoresist) collector lens 14 on; (for example be used for predetermined format; mpeg format) scrambler 20 that the input content-data is encoded; be used for utilizing the key of selecting from cipher key list 30a that this coded data is encrypted; and this encrypted data is formatted into the formatter 21 of the ECC blocks of data that is suitable for writing down; the high-capacity storage medium 23 that are used to store data (for example; hard disk drive); be used for from/to the dish read/write unit 22 of medium 23 read/write data; the data-modulated that is used for being stored in medium 23 is what be used at the enterprising line item of dish; such as the signal modulator 31 of the binary signal of EFM signal be used for the process user input; execution is to the operation of copy protection content; align the generation navigation data of the content that is recorded; and the recording controller 30 of the irradiation of the laser beam on the sense of control photosphere.
In order to utilize device shown in Figure 2 to make read-only disk, at first need to be recorded in the content-data on the read-only disk and the navigation data of this content-data and be written on the medium 23.Before this content-data is stored, this content-data is encrypted by method described below.Recording controller 30 adds the data map that is used for medium 23 is stored to this navigation information to the needed data of read-only disk (for example, key information and the index information that is used for cipher key index).
Under the control of recording controller 30, read the data that are stored in the medium 23 and by signal modulator 31 it is modulated to binary signal subsequently.This collimated laser beam is carried or closed to optical modulator 13 according to the level of this modulation signal, therefore forms the pit train corresponding to this modulation signal on the photographic layer that is positioned on the glass substrate.By the control of recording controller 30, collector lens 14 outwards moves lentamente during pit forms processing, therefore makes this pit train helically shaped.This pit train has been represented and the content-data and the corresponding data of its navigation data that are stored in the medium 23.Utilize the photographic layer that has pit train on it to generate pressing mold, and utilize this pressing mold manufacturing to store according to encrypted content data of the present invention and the read-only disk that comprises the navigation data of enciphered message.
Owing to be stored in this encrypted content data in the medium 23 and comprise that enciphered message (promptly, encryption key message and be used for the index information of cipher key index) navigation data be mapped directly into read-only disk, so the data structure of medium 23 is identical with the data structure of this read-only disk.So,, therefore the method that writes data into medium 23 according to of the present invention is only described now because this method also can be applied to read-only disk.
Owing to also can be recorded on the CD-RW that replaces medium 23 according to encrypted content data of the present invention and the navigation data that comprises enciphered message, therefore also can be applied to rewritable disk (for example, can rewrite Blu-ray disc) according to this recording method of the present invention.Under data are recorded in situation on the rewritable disk, recording controller 30 control servo control units, it is used for optical recording apparatus (for example, optical pickup apparatus) is moved to data with the position that is recorded.
Scrambler 20 is encoded to incoming video signal with special form (for example, mpeg format) and is translated into the ECC piece by formatter 21 and also by read/write unit 22 it is written on the medium 23 subsequently.Also have, the data stream 101 of being carried out precoding by other devices can be provided from other mediums.
Scrambler 20 will be imported content-data and be encoded to GOP, and each GOP comprises guiding I-image and image as much as possible.Recording controller 30 is organized into navigation elements with one or more continuous GOP, makes its playback duration cycle between 0.4 second and 1 second and generate the navigation information of this navigation elements.Being used to generate this navigation elements information necessary is provided by scrambler 20.A content is written as one or more clip file and video title set information (VTSI), is generated and is written as independent file (for example, Video TS.ifo), and described video title set information is the management information of described record data.Can receive the needed information of VTSI that generates from the user by graphical user interface in recording controller 30 based on the menu of programming.
Comprise that (for example, concordance list, movie objects, movie playlist, broadcast item or the like the structure of the management information of) navigation data is not that the present invention is concerned about to this recorded content, and is therefore not described here.To describe in detail according to record of the present invention and reproducting method now, focus on utilizing a key or cipher key combinations that each title is encrypted required enciphered message.
The encryption key that formatter 21 usefulness are selected from encryption key table 30a is to encrypting by scrambler 20 content encoded data or from the content-data that other mediums 101 provide, and this encrypted data is converted to the ECC blocks of data that is suitable for writing down.Dish read/write unit 22 encrypted datas with this ECC form are written in the medium 23.
When each formatter 21 runs into predetermined margin in this coded data, recording controller 30 offers formatter 21 from the encryption key that encryption key table 30a selects encryption key also will select, so that formatter 21 can adopt this encryption key that is used for encrypted data.By data header, the data segment that in each title, comprises or each broadcast specified tentation data border, be stored in the recording controller 30.
Fig. 3 shows the exemplary content that is recorded by each data segment that different encryption keys is applied to by the predetermined margin appointment according to an embodiment of the invention.Each data segment is called content protective system (CPS) unit.
In Fig. 3,, so different encryption keys is applied to the data of being divided by this shared data portion boundary if in clip file, exist by different titles (each title is corresponding to the continuous playback unit information of logic) institute's data shared section.The data of clip file # 1 have by two different title institute data shared sections 30
1, it is divided into three data blocks with these data.Adopt different keys respectively, key 1, key 2 and key 3 are to these three data blocks, and piece # 1, piece # 2 and piece # 3 encrypt.Similarly, the data of clip file # 2 comprise three different encryption keys of employing, and key 4, key 5 and key 6 are to its three data blocks of encrypting.Belonging to same clip file and be called advanced access content system (AACS) key sequence as shown in Figure 3 with each encrypted data block of different encryption keys.
The encryption key that is applied to AACS key sequence as shown in Figure 3 is stored in the key file.This key file has structure as shown in Figure 4.Be set at the part of the front of this key file as content protective system (CPS) number of unit of cipher key index information, and the key that uses is set at the part of the back of this key file.Recording controller 30 generate information field AACS_Key_Index_Info () with the information stores relevant with key in associated clip message file (* .clpi), this key is used for the data that are included in clip file are encrypted, and recording controller 30 will be used for making that the cipher key index information 403 that can conduct interviews to this encryption key that is applied to each sequence is written in information field AACS_Key_Index_Info ().
AACS_Key_Index_Info () field is included in the number of the ACCS key sequence that comprises in the associated clip file 401 and the reference position 402 of each sequence.In the example depicted in fig. 3, be written in that value in the sequence start position 402 of clip file # 1 is 0, a and b.Cipher key index information 403 comprises the information of the CPS_Unit_number of the Key_Index#i inlet that points to the key file shown in Fig. 4, and wherein the CPS number of unit of the memory location of associated encryption key is pointed in each inlet storage.Therefore, pen recorder can be visited a plurality of encryption keys that the data of individual chip file are encrypted of being used for.The field 404 that is called AACS_Key_Index_Start_Address, the start address that it points to AACS_Key_Index_Info () field is stored in the precalculated position in this clip information file.
As a result, can adopt different encryption keys that the title that is recorded on the recording medium is encrypted.In the embodiment shown in fig. 3, with key 1,3 couples of title # 1 of key 2 and key encrypt, and with key 4,6 couples of title # 2 of key 5 and key encrypt.Similarly, encrypt with key 2 and 5 couples of title # 3 of key.
Fig. 5 shows in accordance with another embodiment of the present invention by different encryption keys being applied to the exemplary content that each CPS unit writes down, and wherein is organized as a CPS unit corresponding to each data area of playing item.
In this embodiment, use single key, key 2, CPS_U# 2 encrypts to the data field, and this data field CPS_U# 2 is by the broadcast item 31 of title # 1
2Reference also comprises by a difference broadcast data shared part 30
1, and use single key, and key 3, CPS_U# 3 encrypts to the data field, and this data field CPS_U# 3 is by the broadcast item 32 of title # 2
1Reference also comprises by a difference broadcast data shared district 30
2Therefore, key 2 and key 3 also are stored in two broadcast items 33 that comprise among the title # 3
1With 33
2Key file in.Fig. 6 a shows and is used to allow transcriber to visit the structure of one exemplary embodiment of the key file of this encryption key.
In the embodiment of Fig. 6 a, be used for that the data of any title are carried out encrypted secret key and be written in key memory block 601, and play item at each that belongs to this title and generate and be used for making it possible to index information that the key to the data that are used for encrypted title conducts interviews and it is stored in zone 602.In the embodiment shown in fig. 5, key 1, key 2 and key 3 are written in the key memory block 601.Title # 1 comprises two and plays item, and therefore relevant with two index information field CPS_Unit_number of the broadcast item [k] that stores CPS unit number 1 and 2 respectively.Title # 2 is only relevant with an index information field that stores CPS unit number 3.Similarly, the index information field CPS_Unit_number of the broadcast item [k] relevant with title # 3 stores CPS unit number 2 and 3.
Cipher key file structure shown in Fig. 6 a also comprises address information Start_address_of_CPS_Unit_Info_for_Title[i], it points to the start address of the information relevant with the CPS unit in each title.This address information is used to allow transcriber to visit information on the start address of CPS unit apace.
To be written in each embodiment in playing different with the information that is stored in the key memory block 601 and will allows this key of visit in the key set with all uses shown in Fig. 6 a, and the one exemplary embodiment shown in Fig. 6 b will be used for the encryption key that the data of being play the item reference are encrypted by each is stored respectively at playing 611.
As a result, can adopt different encryption keys that the title that is recorded on the recording medium is encrypted.In the embodiment shown in fig. 5, encrypt with key 1 and 2 couples of title # 1 of key, 3 couples of title # 2 encrypt with key, and encrypt with key 2 and 3 couples of title # 3 of key.
Fig. 7 show according to still a further embodiment pass through different encryption keys is applied to the exemplary content that each CPS unit is recorded, wherein with each clip file as a CPS unit.
In this embodiment, adopt different encryption keys that each clip file is encrypted.In the embodiment shown in fig. 7, exist corresponding to two clip file of title # 1 and title # 2 and with two keys, key 1 and key 2 are encrypted these two clip file.The broadcast item of title # 3 is with reference to included data field in these two clip file, and therefore will be used for that encrypted secret key (that is, key 1 and key 2) is carried out in the data field of this reference and be stored in this clip file.Fig. 8 a shows and allows transcriber to visit the structure of the exemplary key file of this encryption key.
In the embodiment shown in Fig. 8 a, be used for to the data of any title encrypt key be written in key memory block 801, and generate the index information that allows the key to the data that are used for encrypted title (CPS_Unit_number of fragment [k]) to conduct interviews at each clip file that belongs to this title.In the embodiment shown in fig. 7, key 1 and key 3 are written in the key memory block 801.The value of the fragment of title #1 [k] field CPS_Unit_number be written as 1 and the value of fragment [k] the field CPS_Unit_number of title # 2 be written as 2.The Num_of_Clips_in_Title[i of title #3] value of field be written as 2 and the value of fragment [k] the field CPS_Unit_number of title # 3 be written as 1 and 2.
Be stored in the key set shown in Fig. 8 a in the key memory block 801 all uses, and will to be used for allowing the information that this key conducts interviews is written in the embodiment of each clip file different, the one exemplary embodiment shown in Fig. 8 b will be used for the encryption key that the data of the clip file in zone 811 are encrypted is stored respectively at this clip file.
Fig. 8 c shows another embodiment of the key file of storing the encryption key that is used for each clip file.In this embodiment, the information that will be used to discern each clip file (for example, the CPS number of clip file name and clip file) be stored in the zone 821 of the previous section that is arranged in key file, clip file name is consistent with the right number that the CPS number is formed for this clip file.The encryption key of this use is collectively written into part in the back.
As a result, can adopt different encryption keys that the title that writes down on recording medium is encrypted.In the embodiment shown in fig. 7,1 couple of title # 1 encrypts with key, and 2 couples of title # 2 encrypt with key, and encrypts with key 1 and 2 couples of title # 3 of key.
In all previous embodiment, after whole encryption key record were on recording medium 23, recording controller 30 can adopt female key that encryption key is encrypted.
Encrypted data be used for that these data are carried out the relevant information of encrypted secret key and be recorded in recording medium, or by abovementioned steps manufacturing stored encrypted data be used for that these data are carried out the relevant recording of information medium of encrypted secret key.
The method of reproducing the recording medium of being made by said method will be described now.
Fig. 9 shows the block scheme according to the device of the recording medium 71 that is used to reproduce storage encrypted content data and enciphered message of the present invention.Receive the request of reproduction, reproducing control device 70 at first reads the management information that comprises navigation data by Control Driver 73 by optical pickup apparatus 72, and this management information is stored in the storer 79.This management information comprises the Encryption key file with the structure shown in Fig. 4,6a, 6b, 8a, 8b or 8c.
Generate the request of reproduction by user interface (button on the transcriber, telepilot or the like), and can enter user's input by graphical user interface based on the menu of programming in recording controller 30.
Go formatter 74 to carry out relevant error-correction operation of reproducing data.If error correction data comprises the A/V data, then this error correction data is applied to demultiplexer 75.The error correction data (for example, enciphered message, navigation data or the like) that is not the A/V data is applied to reproducing control device 70.
If the encryption key that is stored in the key file is encrypted, then the registered content provider's of reproducing control device 70 usefulness private key is decrypted the encryption key of this encryption, has obtained this private key and it is stored in the external memory storage from the content provider.
Reproducing control device 70 is read with the data segment of the corresponding clip file of title or by reproducing the request title specified by optical pickup apparatus 72 by Control Driver 73.Demultiplexer 75 is decomposed into encoded video and voice data with the input traffic multichannel.The A/V data decode that the encryption key that A/V demoder 76 usefulness obtain by following method is decrypted and will deciphers this encrypted data is to give original video and sound signal for change.
During reproduction processes, monitor the operation of removing formatter 74, demultiplexer 75 and A/V demoder 76 by reproducing control device 70.
When passing through the border of CPS unit, reproducing control device 70 is obtained the encryption key relevant with next CPS unit and is provided this encryption key to A/V demoder 76 from storer 79 at every turn.In the embodiment shown in fig. 3, key file shown in Fig. 4 and clip information file (
*.clip) be loaded into storer 79.Reproducing control device 70 is obtained and the corresponding cipher key index information of the number of ACCS key sequence (key_index[i]), this ACCS key sequence begins to be imported into A/V demoder 76 from clip information file, and reproducing control device 70 read the encryption key (unit key of the encryption of CPS unit #k) that index information points to before providing this encryption key to A/V demoder 76.
In the embodiment shown in fig. 5, be organized as the CPS unit by playing each data field of institute's reference, and the key file shown in Fig. 6 a or 6b is provided and is loaded in the storer 79.Reproducing control device 70 reads whole encryption keys and this encryption key is sequentially offered A/V demoder 76 from the key file that is written in storer 79, so that can be decrypted each CPS unit with the encryption key of encrypting this CPS unit.
In the embodiment shown in fig. 7, each clip file is organized as the CPS unit, and the key file shown in Fig. 8 a, Fig. 8 b or Fig. 8 c is provided and is loaded in the storer 79.Reproducing control device 70 reads whole encryption keys and this encryption key is sequentially offered A/V demoder 76 from the key file that is loaded in the storer 79, so that can be decrypted each CPS unit with the encryption key of encrypting this CPS unit.In the embodiment shown in Fig. 8 c, the filename of the clip file that comprises in the title that is requested to reproduce at first is identified, and obtains the encryption key of this title by the CPS number of unit with the pairing of this document name.
In a preferred embodiment of the invention, the enciphered message shown in Fig. 4,6a, 6b, 8a, 8b or the 8c is recorded on the recording medium.But, also can be used in the mode of under the same way as content-data being encrypted with this enciphered message be stored in be recorded in recording medium 71 on the relevant external server of content-data in.If be equipped with the transcriber of communication function to send the information be used for the content of identification record on recording medium, then this external server determines whether this device is had the right to reproduce this content-data and provided enciphered message as shown in Fig. 4,6a, 6b, 8a, 8b or 8c by network.
Even the present invention by with different encryption keys the different titles that are recorded on the recording medium being encrypted, has protected the copyright that is recorded in the content-data on the high power capacity recording medium effectively under the situation shared by a plurality of titles of some data fields.Though the method by some malice can be revealed the encryption key that is used for the encrypted title data, the data of other titles can be replicated protection as long as carried out encrypting then with other encryption keys to data.
Though utilized a limited number of embodiment to disclose the present invention, those benefit from it will be appreciated by those skilled in the art that many corresponding improvement and variation of the present disclosure.All these improvements and changes all drop in the spirit and scope of the present invention.
Claims (32)
1. recording medium of storing data, these data comprise:
The a plurality of data slots that comprise encrypted content data, each data slot comprise each data segment of this encrypted content data;
A plurality of encryption keys; With
The continuous playback unit information of at least one logic,
Wherein the continuous playback unit information of this logic is linked to the part of at least one data segment or a data segment, and each of a plurality of encryption keys is used to the partial data in each of each or a plurality of data slots of a plurality of data slots is encrypted.
2. recording medium as claimed in claim 1, wherein the continuous playback unit information of this logic is a title.
3. recording medium as claimed in claim 1, wherein the continuous playback unit information of this logic comprises one or more broadcasts items, each plays the data field that a sensing one is correlated with.
4. recording medium as claimed in claim 3, wherein each of a plurality of encryption keys is used to each data field of being pointed to respectively by this broadcast item is encrypted.
5. recording medium as claimed in claim 1, wherein each of a plurality of encryption keys is used to a plurality of data slots each encrypted.
6. recording medium as claimed in claim 1, wherein each of a plurality of encryption keys is used to each data block is encrypted, and described data block is to organize by using by the border in the continuous playback unit information data shared of different logics district in a plurality of data slots each to be divided.
7. recording medium as claimed in claim 1, wherein this recording medium is a read-only recording medium.
8. method at the recording medium identifying recording layer comprises step:
(a) by optionally adopt a plurality of encryption keys to the input content-data encrypt, and with this content data encrypted be recorded on the recording medium as a plurality of clip file, each data slot comprises each data segment of described encrypted content data; With
(b) generate the continuous playback unit information of at least one logic, and the continuous playback unit information of at least one logic and a plurality of encryption key of this generation of record on recording medium,
Wherein step (a) is selected encryption key, make and the partial data in each of each or a plurality of data slots of a plurality of data slots to be encrypted, and wherein the continuous playback unit information of this logic is linked to the part of at least one data segment or a data segment with each of this a plurality of encryption keys.
9. method as claimed in claim 8, wherein the continuous playback unit information of this logic is a title.
10. method as claimed in claim 8, wherein the continuous playback unit information of the logic of this generation comprises one or more broadcasts items, each plays a data field of pointing to a link.
11. as the method for claim 10, wherein step (a) is selected encryption key, makes each of a plurality of encryption keys be used to being encrypted each data field of sensing respectively by this broadcasts item.
12. method as claimed in claim 8, wherein step (a) is selected encryption key, makes that each of a plurality of encryption keys is used to a plurality of data slots each encrypted.
13. method as claimed in claim 8, wherein step (a) is selected encryption key, make each of a plurality of encryption keys be used to each data block is encrypted, described data block is to organize by using by the border in the continuous playback unit information data shared of Different Logic district in a plurality of data slots each to be divided.
14. a device that is used at the recording medium identifying recording layer comprises:
By the ciphering unit that optionally adopts a plurality of encryption keys that the content-data of input is encrypted;
Be used for record cell at the recording medium identifying recording layer; With
Be used to control this record cell with on the recording medium with this encrypted content data record as a plurality of clip file, that be used to generate the continuous playback unit information of at least one logic and be used to control this record cell and be recorded in control module on the described recording medium together with a plurality of encryption keys with the continuous playback unit information of at least one logic that will be generated
Wherein this ciphering unit is selected encryption key, make that each of this a plurality of encryption keys is used to the partial data in each of each or a plurality of data slots of a plurality of data slots is encrypted, and wherein this control module generates the continuous playback unit information of this logic, make the continuous playback unit information of this logic be linked to the part of a data segment at least one data segment or the data, this data segment is a part that belongs to the encrypted content data of a data fragment.
15. as the device of claim 14, wherein the continuous playback unit information of this logic is a title.
16. as the device of claim 14, wherein the continuous playback unit information of the logic of this generation comprises one or more broadcasts items, each plays a data field of pointing to a link.
17. a method of encrypted content data being reproduced from recording medium comprises step:
(a) reproduce a plurality of data slots continuously from recording medium, each of a plurality of data slots comprises the data segment of this encrypted content data; With
(b) by optionally adopting a plurality of encryption keys that the content-data that reproduces is decrypted, each of a plurality of encryption keys is used to the partial data in each of each of a plurality of data slots or a plurality of data slots is encrypted.
18. as the method for claim 17, wherein these a plurality of data slots are linked to the continuous playback unit information of at least one logic, the reproduction of the continuous playback unit information of this logic is asked by the user.
19. as the method for claim 18, wherein the continuous playback unit information of this logic is a title.
20. method as claim 18, wherein step (b) is selected encryption key, make each of a plurality of encryption keys be used to each data block is decrypted, described data block is to organize by using by the border in the continuous playback unit information data shared of different logics district each of a plurality of data slots to be divided.
21. as the method for claim 18, wherein the continuous playback unit information of this logic comprises one or more broadcasts items, each plays a data field of pointing to a link.
22. as the method for claim 21, wherein step (b) is selected encryption key, makes each of a plurality of encryption keys be used to being decrypted each data field of sensing respectively by this broadcasts item.
23. as the method for claim 17, wherein step (b) is selected encryption key, makes that each of a plurality of encryption keys is used to a plurality of data slots each is decrypted.
24., wherein obtain these a plurality of encryption keys from this recording medium as the method for claim 17.
25., wherein obtain these a plurality of encryption keys from external server by network as the method for claim 17.
26. a device that encrypted content data is reproduced from recording medium comprises:
Drive the driver that reproduces the optical reproducing apparatus that is recorded in the data on the recording medium;
The decryption unit that the encrypted data that is read by optical reproducing apparatus is decrypted;
Request is reproduced in response one, Control Driver is reproduced and to be included in the whole or part encrypted content data in a plurality of data slots and to control the controller of decryption unit by optionally adopting a plurality of encryption keys that encrypted content data is decrypted, and wherein each of a plurality of encryption keys is used to the partial data in each of each or a plurality of data slots of a plurality of data slots is encrypted.
27. as the device of claim 26, wherein these a plurality of data slots are linked at least one by the specified continuous playback unit information of logic of the request of reproducing.
28. as the device of claim 27, wherein the continuous playback unit information of this logic is a title.
29. device as claim 27, wherein this control module provides selected encryption key to this decryption unit, make each of a plurality of encryption keys be used to each data block is decrypted, described data block is to organize by using by the continuous playback unit information data shared of different logics section boundary in a plurality of data slots each to be divided.
30. as the device of claim 27, wherein the continuous playback unit information of this logic comprises one or more broadcasts items, each plays a data field of pointing to a link.
31. as the device of claim 30, wherein this control module provides selected encryption key to this decryption unit, makes that each of a plurality of encryption keys is used to each data field of being pointed to respectively by this broadcast item is decrypted.
32. as the device of claim 26, wherein this control module provides selected encryption key to this decryption unit, makes that each of a plurality of encryption keys is used to a plurality of data slots each is decrypted.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63499804P | 2004-12-13 | 2004-12-13 | |
| US60/634,998 | 2004-12-13 | ||
| US60/638,332 | 2004-12-23 | ||
| KR10-2005-0105754 | 2005-11-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101278347A true CN101278347A (en) | 2008-10-01 |
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ID=39996578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800426925A Pending CN101278347A (en) | 2004-12-13 | 2005-12-06 | Method and apparatus for writing and using keys for encrypting/decrypting a content and a recording medium storing keys written by the method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101278347A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486081A (en) * | 2014-12-15 | 2015-04-01 | 英华达（上海）科技有限公司 | Encryption transmission method and system of NFC (Near Field Communication) device data |
-
2005
- 2005-12-06 CN CNA2005800426925A patent/CN101278347A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486081A (en) * | 2014-12-15 | 2015-04-01 | 英华达（上海）科技有限公司 | Encryption transmission method and system of NFC (Near Field Communication) device data |
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