Patent 8190902 was granted and assigned to Microsoft on May, 2012 by the United States Patent and Trademark Office.
Techniques are provided for forming a digital signature for a portion of a document. A registered module is invoked to process the document in accordance with a structured format associated with the document. The registered module is able to process a plurality of different structured formats. The registered module obtains the portion. A digital signature is formed for the portion. The digital signature is included in the document in accordance with the structured format.