METHOD AND SYSTEM FOR SELLING DATA AND STORAGE MEDIUM WITH DATA SALES PROGRAM STORED

摘要

PROBLEM TO BE SOLVED: To solve the problem that it is necessary to limit the destination of rental to the reliable destination of transaction for preventing any secondary use away from the contract of a video since there it no proper method to verify whether or not the contract contents(the purpose of use and the time of use or the like) is preserved in the secondary use. SOLUTION: This data selling method comprises a step for retrieving data, a step for extracting and outputting a part of data in which an electronic watermark is embedded from the data retrieved by the retrieval step, and a step for detecting the electronic watermark information embedded in the data.