That means encryption.Įncryption is a way of scrambling digital content so that it is unusable (not recognisable) unless it is first descrambled (decrypted). Such protection is realised only if there is some means to compel devices to be compliant. Rather, the protection comes from compliant devices responding appropriately to manage the content in accordance with the CMI.
Watermarking does not, in and of itself, protect the content. It stays with the content regardless of the contents’ analogue or digital representation.
Sometimes referred to as usage rules, CMI indicates the conditions and requirements constraining use of the content. Watermarking is a technology that allows content management information (CMI) to be embedded in content in a way that is transparent to the end-user of that content and robust against the information being either removed or altered in any way. CPSA specifies the use of two key technologies – watermarking and encryption – to together provide a means to enforce content protection policies. A comprehensive content protection system depends on both technologies and policies. The CPSA architecture is comprehensive, spanning analogue and digital, audio and video, consumer electronics and PC systems and physical and electronic distribution techniques. Through close collaboration between the relevant groups, it has also been designed to be consistent with and avoid duplication of copy protection measures emanating from the Secure Digital Music Initiative (SDMI). The CPSA architecture has been designed to accommodate the major existing content protection technologies as well as allowing the integration of new technologies as they emerge. Developed by the so-called 4C group – Intel, IBM, Matsushita and Toshiba – in co-operation with the Copy Protection Technical Working Group (CPTWG), the Content Protection System Architecture (CPSA) provides an overall framework for content protection across the entire DVD family.
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