Method for generating licence and method and apparatus for providing contents using the same

A method for generating a license and method and an apparatus for providing contents using the same are provided to download information only for a part which will be changed in an existing license, and use the contents through a changed usage form. A method for generating a license comprises the following steps of: generating license signature information for verification of the license; generating usage rule information for controlling usage of contents; generating authentication code information for verifying coupon information for partially or entirely changing the usage rule information(370); and generating key information necessary for decoding the contents.