Abstract: When the portable reproduction device 4 and the reproduction device 6 establish the communication by the near-distance communication part 56 and 72, a right state transmission means 48 of the portable reproduction 4 transmits to the reproduction device 6 the right state data based on the right data recorded at the right record part 50. Reproduction instruction acquisition means 66 of the reproduction device 6 receives the instruction to reproduce the contents for the reproduction device from the user. According to the right state data transmitted from the portable reproduction means 68 determines whether the reproduction device 6 has the right for the contents instructed to reproduced or not. When it is determined that the right exists, reproduction means 70 reproduce the contents for the reproduction device recording at the content record part 64. When it is determined that no right exists, reproduction is not permitted.

Abstract: [Problems] To provide a system for promoting user-friendly distribution of music composition data while considering the benefit of an author. [Means for Solving Problems] When a user operates a mobile telephone (8) to give a reproduction instruction for reproducing music composition content downloaded, the mobile telephone (8) performs reproduction by converting the music content into waveform music composition data. Here, the mobile telephone (8) generates feature data indicating a feature of the converted waveform music composition data (object feature data). Furthermore, it is judged whether right feature data matched with the object feature data is recorded. If not recorded, the mobile telephone (8) interrupts reproduction. If recorded, the mobile telephone (8) continues reproduction. Thus, only the mobile telephone (8) having the right feature data can reproduce the music composition content.