Distribution of encrypted information

摘要

A secure device capable of selectively enabling decryption of units of information is used to provide access to a stream of units of encrypted information. Each unit is linked to a time-stamp. An entitlement management message entitles the secure device to enable decryption of units of information that are linked to time-stamps with values in a specified range. The range has a starting point substantially prior to a current time value of the time stamps distributed concurrent the entitlement message. In an embodiment the stream is distributed to a plurality of subscribers, each with an own secure device. The distance of the starting point to the current time value for each subscriber is selected dependent on subscription information for the subscriber.