The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 05, 2006
Filed:
Apr. 27, 2000
Hideyuki Hirano, Kawasaki, JP;
Seigo Kotani, Kawasaki, JP;
Shinji Hashimoto, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A data management method that by encrypting and distributing digital content prevents copyright infringement, and that prevents authorization information for decrypting the encrypted digital content from being damaged or otherwise lost. Encrypted contentis prepared by encrypting digital contentwith a content keyA portion of the digital contentis extracted as sample dataA secret keyby which the content keyis encrypted with user informationis embedded as invisible information into the sample datathus preparing watermarked sample dataThe watermarked sample datais synthesized with the encrypted contentto form synthesized dataThe synthesized datais distributed.