Patent ID: 8094820

Claim:
An information recording/reproducing apparatus in which content has been recorded, the content being reproduced through an external content reproducing apparatus, the information recording/reproduction apparatus comprising: a title key generator for generating a title key of said content; a content encoder for encrypting said content according to said title key; a content storage for storing the encrypted content; a navigation information storage for storing said title key; a title key encoder for encrypting said title key; an interface for inserting an external medium and exchanging data with said external medium; a transmitting/receiving device for communicating with said external content reproducing apparatus; and a controller, wherein: said controller reads out a medium ID from said external medium through said interface, and stores in said navigation information storage said medium ID as a medium ID for encrypting, said controller reads out said title key and said medium ID from said navigation information storage and outputs said title key and said medium ID to said title key encoder, said title key encoder encrypts said title key according to said medium ID, said controller outputs said encrypted title key and a connecting method for connecting said external content reproducing apparatus to said transmitting/receiving device to said external medium through said interface, and said controller, when a request for content and a medium ID for decrypting are received from said external content reproducing apparatus, judges whether said medium ID for encrypting coincides with said medium ID for decrypting or not, and in case said medium ID for encrypting coincides with said medium ID for decrypting, reads out the encrypted content from said content storage, and transmits said encrypted content to said external content reproducing apparatus through said transmitting/receiving device.