Method and system for adding a conditional access system

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A digital audio/video transmission system that facilitates the addition of a conditional access system in delivery of content, comprising:

• a service provider-broadcast source configured to transmit a data stream having system information data including an unused packet identifier reserved for security data associated with said additional conditional access system;
• and
• a downstream security device of a subscriber associated with an audio/video processing device, and configured to provide security data in packets associated with said unused packet identifier.

A security device of a subscriber device in a conditional access system comprising:

• input coupled to the subscriber device and configured to receive a data stream, transmitted from a service provider-broadcast source, having system information data including an unused packet identifier reserved for security data associated with an additional conditional access system;
• and
• a processor configured to insert into said data stream said security data associated with said additional conditional access system.

A service provider-broadcast source that facilitates creating system information tables included in a data stream sent to a downstream security device of a subscriber, which downstream security device of a subscriber adds an additional conditional access system to said data stream, comprising:

• a multiplexer configured to provide an output stream including table entries in at least one of said tables having an unused packet identifier reserved for security data associated with said additional conditional access system.