| 摘要 |
A method for realizing preview of IPTV programs, an encryption apparatus, a right center system and a user terminal are provided. The preview groups are set up in the Digital Right Management DRM encryption system; DRM encryption system generates the group authorization information for the terminal according to the preview groups, and sends it to the terminal; the terminal obtains the Content Encrypt Key CEK or the seeds which generating the CEK, of the selected preview program in the corresponding preview group according to the received group authorization information, and decrypts the selected program, so as to preview the program. The prior authorization of program group can be realized using the method according to the invention, so, not only the parallel access numbers to the right center can be reduced such that the reliability of the system can be improved, but also the users' waiting time can be reduced such that the users' experience can be improved; further, the preview rules which can be arranged provide flexible business running method for providers, such as several programs with the same preview rule can be packed to be distributed.
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