| 摘要 |
The invention relates to a method for a playback sequence on an optical disc (100) for controlling access to information (107). The optical disc comprises a navigation structure (104) and content (103). The navigation structure (104) comprises conditional commands, which comprise preconditions. Depending on the precondition, a player always acts (109) to the conditional command in a way predefined in an applicable optical disc standard. The method is able to recognize special preconditions inside conditional commands, so called preset preconditions (111). A player comprising the method can be instructed to act in a different (113) than the predefined way to the conditional command comprising preset preconditions. Implementing conditional commands comprising preset preconditions on an optical disc, results in a behavior of a player comprising the method being different from a player not comprising the method. This can be used to control access to information (107) on the disc (100).
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