Method of playing system stream files with different recording formats

A non-transitory tangible recording medium in which is recorded AV data,

• the AV data having a system stream file including encrypted video information, and a management information file recording management information corresponding to the system stream file,
• the system stream file including
• a first segment in which is repeated a first data unit that can be decrypted using a first decryption key that the playback device that plays the AV data recorded in the recording medium individually has and a second data unit of the same data size as the first data unit but cannot be decrypted by the first decryption key, and
• a second segment which can be decrypted using a second decryption key that the playback device has in common with another playback device,
• wherein the management information file has a time map in which are correlated an I-picture serving as a random access point, and a presentation clock time of the I-picture,
• and wherein the I-picture regarding which the presentation clock time is indicated in the time map is multiplexed in the second segment.