Digital Transmission Content Protection
The Digital Transmission Content Protection (DTCP) (also Digital Transmission Copy Protection ) is a cryptographic protocol to protect audio and video data from unauthorized copying, interception and manipulation. It is used for transmission via digital interfaces (e.g. Firewire, USB, TCP / IP).
The protocol was developed by Intel , Matsushita (Panasonic), Sony , Toshiba and Hitachi .
It is used for video-on-demand , for example , so that films that have been accessed cannot be recorded or intercepted without authorization.
The data stream is encrypted with a certain code depending on the source and the receiving device needs a suitable license to decrypt the data. It is important that all links in the transmission chain - from the transmitter to the output device (monitor / TV set) - can both decrypt the data stream and encrypt it again.
The encryption algorithms used have been adapted to the state of the art following the bad experience with CSS .