Patent ID: 7506365
Filing Date: 2009-03-17
Classification: G06F

Abstract:
1. A method of distributing a structured document in which identifiers are respectively set for a plurality of information items in document data made of digitized data including text data, image data, music data, and/or other digitized data, and information content of each information item is enclosed in each respective identifier, the method comprising: creating access control information necessary to access the document data and separating the access control information into a first access control information and a second access control information, the first access control information is any one of encrypted data, authentication information, encryption key information, a control program, or distribution channel information; specifying given data as administrative information-enclosing data and embedding the first access control information into the administrative information-enclosing data; setting an administrative identifier for making the administrative information-enclosing data in which the first access control information is embedded be an information item in the document data; and enclosing, in the administrative identifier, information content of the administrative information-enclosing data in which the first access control information is embedded, and the second access control information for extracting the first access control information from the administrative information-enclosing data to create the access control information for accessing the document data together with the first access control information, wherein the second access control information comprises at least one of range-specifying information specifying the range of unauthorized alteration prevention in the document data, data type-indicating information indicating the type of the digitized data in which watermark data have been embedded, control type-indicating information indicating the type of information of the first access control information, access policy information for digitized data contained in the document data, watermark control information used when converting the first access control information into watermark data, and a data name of the first access control information.