Abstract: The disclosure provides an information transmission method, system and data card, wherein the method comprises: a sender scrambling original information in a predetermined scrambling way, and sending scrambled information to a receiver; the receiver receiving the scrambled information, and descrambling the scrambled information in a predetermined descrambling way to obtain the original information, wherein the predetermined scrambling way corresponds to the predetermined descrambling way. In accordance with the disclosure, contents to be transmitted are scrambled and the scrambled contents are sent to the receiver, and the receiver can restore the transmitted contents by performing descrambling according to the scrambling way used by the sender. The disclosure can avoid the transmitted contents from being monitored, as well as avoid the keys from being stolen; therefore, the security of the transmitted contents is effectively improved.

Abstract: The present invention provides a method and a device for receiving a mobile digital multimedia service and terminal equipment for a mobile digital multimedia service, and the method for receiving the mobile digital multimedia service includes: a receiving device receiving multimedia broadcast data, and if the receiving device judges that a state of the multimedia broadcast data is a scrambling state, descrambling the multimedia broadcast data, and sending descrambled multimedia broadcast data to computer equipment, and the computer equipment receiving the descrambled multimedia broadcast data. The technical scheme of the present invention does not need to send key information needed in descrambling to the computer equipment, so that the security of the key information can be increased; and the receiving device re-encapsulates the multiplex subframe and retains the subframe header part in the multiplex subframe, so as to make the descrambled data code steam entirely retain the original information.

Abstract: The disclosure provides an information transmission method, system and data card, wherein the method comprises: a sender scrambling original information in a predetermined scrambling way, and sending scrambled information to a receiver; the receiver receiving the scrambled information, and descrambling the scrambled information in a predetermined descrambling way to obtain the original information, wherein the predetermined scrambling way corresponds to the predetermined descrambling way. In accordance with the disclosure, contents to be transmitted are scrambled and the scrambled contents are sent to the receiver, and the receiver can restore the transmitted contents by performing descrambling according to the scrambling way used by the sender. The disclosure can avoid the transmitted contents from being monitored, as well as avoid the keys from being stolen; therefore, the security of the transmitted contents is effectively improved.

Abstract: The present invention provides a method and a device for receiving a mobile digital multimedia service and terminal equipment for a mobile digital multimedia service, and the method for receiving the mobile digital multimedia service includes: a receiving device receiving multimedia broadcast data, and if the receiving device judges that a state of the multimedia broadcast data is a scrambling state, descrambling the multimedia broadcast data, and sending descrambled multimedia broadcast data to computer equipment, and the computer equipment receiving the descrambled multimedia broadcast data. The technical scheme of the present invention does not need to send key information needed in descrambling to the computer equipment, so that the security of the key information can be increased; and the receiving device re-encapsulates the multiplex subframe and retains the subframe header part in the multiplex subframe, so as to make the descrambled data code steam entirely retain the original information.