Method for preventing VOD (Video-On-Demand) programs from being illegally spread and shared

Abstract

The invention discloses a method for preventing VOD (Video-On-Demand) programs from being illegally spread and shared. The method comprises the following steps of: S101: receiving a scrambled / encrypted program stream and an authorization message by a set top box; S102: acquiring a key for descrambling / decrypting according to the authorization message for decrypting the scrambled / encrypted programstream to obtain a program clear stream; S103: generating a new encrypting KEY by using identification information of the set top box; S104: encrypting the program clear stream by using the encrypting KEY and storing the encrypted program stream on a nonvolatile-memory connected with the set top box; S105: when the programs on the nonvolatile-memory are played, generating a decrypting UKEY corresponding to the encrypting KEY by using the identification information of the set top box; and S106: decrypting the program stream by using the UKEY and playing the decrypted program stream. Accordingto the method disclosed by the invention, the downloaded program data can be effectively prevented from being illegally copied, distributed and shared, the copyright of the programs is guaranteed andhigh safety is obtained.

Description

technical field [0001] The invention relates to the technical fields of digital television and video-on-demand, in particular to a method for preventing illegal transmission and sharing of VOD programs. Background technique [0002] With the development of science and technology and the popularization of digital TV, the VOD (Video On Demand, video on demand) service has been widely used, and has become one of the important means to realize value-added of cable digital TV. At present, VOD mainly has three forms: NVOD, TVOD and Push VOD. Among them, NVOD (near VOD, quasi video on demand) has low operating cost, but the number of programs is small, and fast forward and rewind operations are inconvenient; TVOD (true VOD) needs to be Two-way network transformation, deploying a large number of video-on-demand servers, and upgrading two-way set-top boxes are costly. The most difficult thing is that each set-top box needs an independent video channel, and the broadcasting network ha...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of illegal copying, distribution and sharing of digital content in Push VOD and other businesses that download digital content and then carry out subsequent applications, and propose a method for preventing illegal transmission and sharing of VOD programs. Descramble / decrypt the scrambled / encrypted program to obtain the program clear stream; then use the set-top box identification information related to the specific terminal set-top box to encrypt the program clear stream, and save the encrypted program on a storage device such as a local hard disk; When ordering, the decryption key is generated according to the set-top box identification information to decrypt the program, and then realize the playback

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