Digital Rights Management in an information terminal

摘要

When content owned by a source device (SDa) are played back in a rendering device (RDa), a content key is transferred from the source device (SDa) to the rendering device (RDa) via a secure session every time playback is carried out. Then, encoded content are decoded and played back to be outputted by using the transferred content key so as to discard the content key after the end of playback.