Content usage system, content usage method, recording and playback device, content delivery method, and content delivery program

A content usage system includes a recording and playback device and a portable electronic device mutually connected via a network. When the recording and playback device receives a certain command while outputting digital content, that content is converted into transfer content suitable for use with the portable electronic device, and then stored with metadata indicating that the content is transfer content. Using the metadata, the recording and playback device is able to generate and transmit a list of transfer content upon request from the portable electronic device. Using the list, the user of the portable electronic device then selects desired transfer content from the list and sends a transfer content request. In response, the recording and playback device transmits the selected transfer content to the portable electronic device, thereby making the content available for use on the portable electronic device.