CI+

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CI+ or Common Interface Plus is a specification that extends the Common Interface (DVB-CI) as found in the digital broadcasting standard DVB. It has been developed by consumer electronic firms Panasonic, Philips, Samsung and Sony, as well as pay-TV technology company SmarDTV and fabless chip maker NEOTION.

A first draft of the specification has been put up for review early in 2008. CI+ implements a form of copy protection between a Conditional Access Module (CAM) and the digital television receiver (DTV).

By making use of certificates and a certification authority, a trusted channel is formed between the CAM and DTV, when scrambled content is being received. In the original CI standard, decrypted content could be sent over the PCMCIA interface unscrambled.