Content transmission device and content reception device

A content transmission equipment comprising:

• first authentication means for executing a first authentication process based on a first authentication method and sharing first key information with a content reception equipment connected to an in-home network;
• remote access information sharing means for sharing second key information required for communication from a remote place with said content reception equipment connected to the in-home network;
• device information management means for managing the information on said content reception equipment authenticated by said first authentication means and said second key information shared by said remote access information sharing means;
• second authentication means for executing a second authentication process using said second key information shared by the remote access information sharing means with said content reception equipment connected to the remote network;
• encryption means for executing the encryption process on the content transmitted to the in-home content reception equipment using said first key information or on the content transmitted to the remote content reception equipment using said second key information;
• and
• timer means for counting the time;
• wherein
• said second key information is shared only with said content reception equipment successfully subjected to said first authentication process by said first authentication means;
• and
• the contents are not sent to the remote content reception equipments other than said content reception equipment registered in said device information management means and successfully subjected to said second authentication process by said second authentication process.