Content protection authorizing system and content protection authorizing method supporting cross-terminal application

The invention relates to content protection authorizing system and content protection authorizing method supporting cross-terminal application. The content protection authorizing system comprises a client end module which is located on a user side, and a user management module, a content management module and a server end module which are located on a system side, wherein the client end module is mainly used for requesting to authorize play of requested content, and for decrypting play content; the user management module is mainly used for determining whether the requested content or a content group in which the requested content locates is in an access authority list of a requesting user; the content management module is mainly used for managing content resource in groups and for encrypting the content resource; and the server end module is mainly used for inquiring whether the requested content is in the access authority list of a user which is bound with terminal equipment and for generating an encrypted authority certificate. According to the content protection authorizing system and the content protection authorizing method supporting cross-terminal application, a method which uniformly authorizes protected contents is realized by setting content groups and by managing in a way of binding a plurality pieces of terminal equipment with the uniform user account number, so that the user can use the same content in different encoding formats on different types of equipment without buying the content repeatedly.