ENCRYPTION DEVICE, DECRYPTION DEVICE, AND DATA REPRODUCTION DEVICE

摘要

a file read out section (101) for acquiring a file consisting of a data section (mdat) containing at least one of encoded video data, audio data, and text data and a header section (moov) containing a header of the data section; a data encryption section (106) for encrypting at least one of the data stored in the data section of the file; a header analysis section (102) for analyzing the file header and acquiring the value of the field (EINFO) indicating the encoding method of the data contained in the header section and to be encrypted in the data encryption section (106); a header conversion section (104) for converting the acquired value according to a predetermined conversion rule and rewriting the field value to a converted value; and a file output section (105) for outputting a file consisting of a header section (moov') containing a filed (EINFO') whose value has been rewritten and a data section (encrypted mdat) containing the encrypted data.