METHOD AND CONDITIONAL ACCESS SYSTEM APPLIED TO THE PROTECTION OF CONTENT

摘要

The invention relates to an access control method controlling access to a broadcast digital dataflow previously scrambled. The method according to the invention includes the following steps: On transmission: generating an entitlement control message R-ECMc for recording the content of the flow as a function of a key KRc and at least one criterion CRR defining a right to the record, generating an entitlement control message P-ECMc controlling access to play back the content of the recorded flow as a function of a key KPc and at least one criterion CRP defining a right to play back, and on reception: analysing the messages P-ECMc and P-ECMc, authorizing the recording and playback if the criteria CRR and CRP are verified.