Method, device and system for processing streaming media contents

A conditional access system, comprising:

• an encryption module, configured to encrypt streaming media contents and generate corresponding Entitlement Control Message (ECM) and Entitlement Management Message (EMM);
• and
• a transmitting module, configured to transmit the encrypted streaming media contents, the ECM and the EMM, wherein each I frame of the encrypted streaming media contents is segmented into multiple data packets for transmission and the ECM is transmitted during the transmission of the multiple data packets.

A computer readable medium, comprising computer program codes, which, when executed by a computer unit, cause the computer unit to perform:

• encrypting the streaming media contents and generating corresponding Entitlement Control Message (ECM) and Entitlement Management Message (EMM);
• and
• transmitting the encrypted streaming media contents, the ECM and the EMM, wherein each I frame of the encrypted streaming media contents is segmented into multiple data packets for transmission and the ECM is transmitted during the transmission of the multiple data packets.