Patent ID: 8819843

Claim:
A machine-implemented method for distributing non real-time (NRT) content over a distribution network, the method comprising: encrypting, by a processor, the NRT content with a control word to generate encrypted NRT content; providing the control word to one or more entitlement control message (ECM) generators, wherein the one or more ECM generators comprise a first ECM generator associated with a first conditional access system that encrypts the control word using a first long term key to generate a first ECM, and a second ECM generator associated with a second conditional access system, different than the first conditional access system, that encrypts the control word using a second long term key to generate a second ECM, wherein the first long term key and the second long term key are different; receiving one or more ECMs from the one or more ECM generators, respectively, wherein each ECM comprises a unique encryption of the control word such that a user having access to the first long term key or the second long term key can decrypt the control word; and encapsulating the encrypted NRT content and the one or more ECMs into an encapsulated file for transmission over the distribution network, wherein a file format of the encapsulated file comprises a clip definition record that identifies the first conditional access system that generated the first ECM and the second conditional access system that generated the second ECM.