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DVD-Audio content may use both CSS and CPPM CPPM is planned for use on other prerecorded media such as SD memory cards CPPM has some similarities to CSS but is more robust and sophisticated It has no title keys, and the disc key is replaced by an album identifier The role of the album identifier is to provide a key that cannot be duplicated on recordable media, since it is stored in the control area of the lead-in, which is not accessible on writable discs Each player has a set of 16 device keys Key sets may be either unique to each device or shared by multiple devices Device keys are highly confidential Rather than secretly storing the set of all known device keys on the disc, CPPM stores a media key block (MKB) in the DVDAUDIOMKB file on the disc The media key block is provided by the 4C entity to disc replicators The player performs a series of decryptions and mathematical transforms on the media key block with its device key The resulting media key is used with the album identifier to decode the encrypted portions of the disc If a device key is revoked, the media key block is changed on future discs Revoked players will then generate an invalid media key that will not decrypt the disc11 As with CSS, only audio, video, subpicture, and still picture sectors are encrypted Other sectors containing navigation, highlight, and real-time information are not encrypted Content Protection for Recordable Media (CPRM) CPRM is a mechanism that ties a recording to the medium on which it is recorded It was developed by the same 4C group that created CPPM and shares many features CPRM is supported by all DVD recorders released after 1999 The goal of CPRM is to enable a recording to be made and played on different devices while ensuring that copies of the recording will not be playable CPRM is defined for writable DVD formats and for SD memory cards It is intended to be used for other recordable media such as compact flash cards and microdrives Each blank recordable DVD disc has a unique 64-bit media identifier (media ID) etched in the burst cutting area (BCA; see 5) This means that each disc can be uniquely distinguished from all other recordable discs The media ID does not have to be secret but must be an unalterable value tied to the medium When protected content is recorded onto the
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This feature is called renewability by the creators of the process, but it does not renew anything On the contrary, it can make formerly functioning devices cease to work Perhaps they were thinking of renew as used in Logan s Run A problem with revocable devices is that if keys are stolen or the system is cracked so that legitimate keys can be used in unauthorized devices, the keys cannot be revoked without making hundreds or thousands of genuine players stop working
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disc, it is encrypted with a media unique key derived from the media ID and the media key During playback, the media ID is read from the BCA and used to generate a key to decrypt the contents of the disc If the contents of the disc are copied to another medium, the ID will be absent or wrong, and the data will not be decryptable When recording, the recorder generates a title key that is used to encrypt content on the disc Each disc includes one title key If something has already been recorded, then the existing title key is used to encrypt new content as well As with CPRM, each disc contains a media key block that is used to control the validity of device keys Unlike CPPM, the media key block is prerecorded in the control area of the disc, where it cannot be changed The recorder uses its set of 16 device keys to process the media key block and produce a media key The recorder then uses the media key and the media ID to encrypt the title key before recording it on the disc The media key and media ID are not used to encrypt recorded content, only to encrypt the title key, which is used (along with CCI) to encrypt the actual A/V sectors CPRM improves on the revocation features of CPPM by allowing recorders to update the media key block by writing a media key block extension to a file on the disc This allows new revocation information to be disseminated quickly Since the media key block is not a secret, it can be sent over the Internet to CPRM devices Only one media key block extension is included on a disc It is replaced by newer versions as they become available Writing a new media key block extension changes the media key, so the title key must be reencrypted with the new key Media key block extensions can only alter a media key generated by the static media key block (and thus revoke device keys); they cannot generate a media key, so they cannot be hacked to enable new device key sets Writing media key block extensions is optional for recorders; reading is mandatory To play CPRM-encrypted content, a player generates a media key by applying its device key set to the media key block that it reads from the control area of the lead-in It reads the media ID from the BCA and combines it with the media key to generate a media unique key that it then uses to decrypt the title key after reading it from the video or audio zone on the disc The decrypted title key can then be used to decrypt the encrypted sectors As with CPPM and CSS, only A/V sectors (video, audio subpicture, and so on) are encrypted Navigation and other sectors, such as the real-time data information (RDI) sectors of DVD-VR, are not encrypted Analog Protection System (Macrovision) Copying from DVD to VHS or other analog recording systems is prevented by a Macrovision or similar circuit in the player The general term is analog protection system (APS)
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