[edit] DRM features
The
digital rights management scheme embedded in the SD cards is defined as the
Content Protection for Recordable Media (CPRM) by the
4C Entity and is centered around use of the
Cryptomeria cipher (also known as
C2). The specification is kept secret and is only accessible to licensees.
DVD-Audio uses a very similar scheme known as Content Protection for Prerecorded Media (CPPM). This type of DRM is associated with the reclusive
SDMI, an organisation set up by the
RIAA to promote such hardware-based copy protection schemes. Many SD cards are marked on the packaging as being 'SDMI Compliant' for this reason. This DRM has not been seen "in the wild" and few, if any, devices appear to provide support for it.
Super*Talent, a manufacturer of computer memory, has created the "Super Digital" card. They are the same in appearance and function to regular Secure Digital cards, but they lack the CPRM code commonly found in Secure Digital cards.
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Regards
Honda