Patent ID: 7778927

Claim:
A content reproduction apparatus, comprising: a group ID storage section configured to store a group ID produced uniquely according to a user account when said content reproduction apparatus is registered to the user account in a management server; a radio transmitter section configured to transmit content stored in a content storage section to a different apparatus by radio communication; a radio receiver section configured to receive content transmitted from the different apparatus by radio communication; a reproduction decision section configured to determine, based on a group ID included in the received content and the group ID stored in said group ID storage section, whether or not the content received by said radio receiver section can be reproduced; a reproduction execution section configured to reproduce the content received by said radio receiver section when said reproduction permission/inhibition decision section determines that the content can be reproduced; an ID recording section configured to record in an ID storage section a content ID and group ID corresponding to content reproduced by said reproduction execution section; and a data communication section configured to transmit the content ID and the group ID recorded in said ID storage section to a content distribution server, when the content reproduction apparatus is directly or indirectly connected to the content distribution server.