Method and system for transmitting compressed rights

A method for transmitting compressed rights, comprising:

• negotiating, by a terminal, a compress algorithm of rights with a server;
• requesting, by the terminal, the server through an “Extensions” field in a rights object request (RORequest) message to transmit the rights in compression format;
• generating, by the server, a rights object response (ROResponse) message according to a standard approach, compressing the rights in the ROResponse message according to the negotiated compress algorithm, generating a compressed ROResponse message, and sending the compressed ROResponse message to the terminal;
• and
• receiving, by the terminal, the compressed ROResponse message, decompressing the rights in the received ROResponse message according to the negotiated compress algorithm, and generating a decompressed ROResponse message;
• wherein negotiating, by the terminal, the compress algorithm of rights with the server comprises:
• sending, by the terminal, a device hello request (DeviceHello) message to the server, and informing the server about self-supported compress algorithms through a “Supported Compress Algorithm” field newly added in the DeviceHello message;
• and
• selecting, by the server, the compress algorithm agreed by negotiating according to content of the “Supported Compress Algorithm” field, and informing the terminal of the selected compress algorithm through a “Selected Compress Algorithm” field newly added in a rights server hello response (RIHello) message;
• wherein requesting, by the terminal, the server through the “Extensions” field in the RORequest message to transmit the rights in compression format comprises:
• sending, by the terminal, the RORequest message to the server, and informing the server through a “Need Compress Rights” field newly added in the “Extensions” field of the RORequest message to transmit the rights in compression format.