Server device, client device, information processing system, information processing method, and program

At least one non-transitory computer-readable storage medium having encoded thereon executable instructions that cause a first computing device operated by a user to carry out a method comprising:

• storing, on the first computing device operated by the user, information on a plurality of pieces of content data that the user has permission to reproduce, each piece of content data comprising audio and/or video content, the information identifying a first content data that is stored in a first data format on a second computing device operated by the user;
• controlling transmission, from the first computing device to a media distribution service comprising at least one third computing device, of a request for the first content data and a demonstration that the user has permission to reproduce the first content data, the demonstration that the user has permission to reproduce the first content data comprising an identifier for the first content data that identifies the first content data in a manner that is generic to a data format of the first content data;
• and
• controlling receipt, at the first computing device from the media distribution service in response to the transmitting of the request and the demonstration that the user has permission to reproduce the first content data, of the first content data in a second data format different from the first data format.