Content transmission control device, content distribution device and content receiving device

A content delivery device to deliver content via a network,

• said content delivery device comprising:
• a storage device storing an authentication code key which is data for generating an authentication code to verify validity of a number of possible transmission times of content;
• a device authentication controller authenticating a delivery destination device of said content;
• a packet creation unit, in response to the delivery destination device being a delivery destination terminal, successfully authenticating said delivery destination device by said device authentication controller, generating said authentication code based on said number of possible transmission times and said authentication code key, and in response to the delivery destination device being a router, unsuccessfully authenticating said delivery destination device by said device authentication controller, limiting said number of possible transmission times, such that transmitting said content to said delivery destination device is avoided;
• said packet creation unit further configuring said number of possible transmission times and said generated authentication code in a packet including said content;
• and
• a delivery controller transmitting said packet to said delivery destination device of said content.