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:
Mar. 17, 2009
Filed:
Nov. 22, 2002
Hideyuki Hirano, Kawasaki, JP;
Shinji Hashimoto, Kawasaki, JP;
Hideyuki Hirano, Kawasaki, JP;
Shinji Hashimoto, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A document distributing method is proposed using access control information separated into invisible data embedded as an electronic watermark and visible data described in a structured document to achieve prevention of unauthorized alteration of document data, authentication thereof, and prevention of unauthorized access thereto. The method has a step of separating access control information into a first access control information and a second access control information, a step of embedding the first access control information into administrative information-enclosing data, a step of setting an administrative identifier for making the administrative information-enclosing data in which the first access control information has been embedded be an information item in the document data, and a step of enclosing, in the administrative identifier, information content of the administrative information-enclosing data and the second access control information for creating the access control information for accessing the document data together with the first access control information.