| 摘要 |
Methods, systems, computer-readable media, and apparatuses for providing control word and associated entitlement control message (ECM) functionalities are presented. In some embodiments, a computing device may cache concurrently a first set of control words and a first set of entitlement control messages (ECMs) associated with the first set of control words. The computing device may encrypt a transport stream with a particular control word of the first set of control words. The computing device may insert a particular ECM, of the first set of ECMs, corresponding to the particular control word into the transport stream sent to a device downstream from the computing device. In some embodiments, a computing device may reuse control words and associated ECMs. |
| 主权项 |
1. A method comprising:
caching concurrently, by a computing device, a first set of control words and a first set of entitlement control messages (ECMs) associated with the first set of control words; encrypting a transport stream, for a first service, using a first control word of the first set of control words during a first cryptographic period; encrypting the transport stream, for the first service, using a second control word of the first set of control words different from the first control word during a second cryptographic period, wherein the second cryptographic period occurs after the first cryptographic period; encrypting the transport stream, for the first service, using the first control word of the first set of control words during a third cryptographic period, wherein the third cryptographic period occurs after the first cryptographic period and the second cryptographic period; inserting into the transport stream, for the first service, a first ECM, of the first set of ECMs, corresponding to the first control word; and sending, to a device downstream from the computing device, the transport stream. |
