| 摘要 |
In order to modify an encrypted multimedia data stream, a device connected to a control source and receiving said stream as input, carries out the following steps: receiving a message from the control source, comprising information enabling a separation of the input stream into at least one first sub-stream and one second sub-stream to be identified; decoding the encrypted data of the first identified sub-stream(s); modifying the encrypted data of the identified first sub-stream(s), the modification being made starting from the information received from the control source; encrypting the modified data of the first sub-stream(s); and combining the modified and encrypted data of the first sub-stream(s) with the second sub-stream, in such a way as to obtain the encrypted multimedia data stream as output of the device. |
