Document 1 discloses a method where the second encryption key for a video slice is generated based on a portion of frame information contained in the target frames of the video slice to be encrypted, as well as the first encryption key corresponding to the video file to which the video slice belongs. This second encryption key is used as the initial key to encrypt the corresponding frame data of the video slice, resulting in encrypted data for the corresponding frame data of the video slice. This method involves replacing the corresponding frame data part of the video slice with the corresponding encrypted data, while retaining the metadata of each frame of the video slice and other unencrypted frame data, thus completing the encryption of the video slice. The unencrypted other frame data includes the portion of frame information in the target frame.
Document 2 discloses a signal decryption unit, used to generate decryption rules according to the rules provided by the decryption rule generation unit. This un