Sending apparatus, receiving apparatus, use limit system and method of sending contents

摘要

A use limit system in which only contents users who have made a viewing contract can decrypt encrypted contents and use the contents. Use limit is set on contents on the basis of the physical features of the rightful user. The use limit system is made up of a sending apparatus for sending the contents and a receiving apparatus which removes use limit of contents sent from the sending apparatus by acquiring the physical features of the rightful user of contents.