A PDF file is usually stamped or marked or labelled by the PDF creation software. The hidden information is stored in the header part of the PDF file. With PDF Info, you may change PDF document properties, including author, title, subject, Stichwörter, creator, and producer information. You may even add or remove hidden information. Freeware with no advertisement, no spyware or clickbot module. For more information, visit http://www.bureausoft.com/products.html