| 摘要 |
Methods for using a conditional access system to modify access control information maintained at a set-top box or another client system. The access control information regulates the availability of information or entertainment services at the client or controls the ability of scripts executed at the client to access objects defined at the client. The conditional access system can be a conventional conditional access, such as those used by cable television providers, that has been adapted to modify the access control information. The access control information includes multiple entries, each being referenced by a token identifier. The conditional access system transmits a command and an accompanying token to the client to instruct the client how to modify the access control information. The entry that is to be modified is identified by comparing the token with the token identifiers. By modifying access control information in this manner, the entity that operates the conditional access system is capable of regulating the availability of resources or services at the client. For example, a selected level of a tiered information service can be made available to the client.
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