ABSTRACT
The general application scenarios are shown in Figure 8.1. In the first case without encryption, the media content is compressed into the media stream with scalable media encoding, then the media stream’s size is changed by bit rate conversion, and finally, the converted media stream is decompressed with scalable media coding. In the second case with encryption, the encryption operation is inserted between the compression operation and bit rate conversion operation. Because the encrypted media stream can still be recovered after bit rate conversion, the encryption operation is called scalable encryption.
