The embodiment of the invention provides a layered
encryption method, decryption method,
system and device for video and audio digital copyright, and the method comprises the steps: obtaining and dividing to-be-encrypted video and
audio media content streams of a first video and
audio media content layer and a second video and
audio media content layer into a plurality of first to-be-encrypted video and audio
media content and a plurality of second to-be-encrypted video and audio
media content, the first layer and the second layer have the same content; and generating a first
encryption key, a second
encryption key, a first decryption key and a second decryption key, and encrypting the first to-be-encrypted video and audio
media content and the second to-be-encrypted video and audio media content by using the first encryption key and the second encryption key respectively to obtain the first encrypted video and audio media content and the second encrypted video and audio media content, the starting position of the second encrypted video and audio media content of the first layer is within the duration range of the first encrypted video and audio media content of the second layer, the decryption time consumed by a
single frame in the first encrypted video and audio media content is shorter than that consumed by a
single frame in the second encrypted video and audio media content, and playing is more stable while the playing starting speed of a playing end can be increased.