Submission + - The Stamp of Incompetence (heise-security.co.uk)
juct writes: "The electronic stamp service of the German Deutsche Post is a text-book example of how not to implement digital rights management. According to heise Security the PDF keeps you from printing the electronic stamp multiple times by phoning home. Bad luck if your printer had a paper jam the first time you tried to print. Circumventing this "copy protection" is as easy as printing into a file or making a regular photocopy. The copy protection mainly has been implemented to create some kind of barrier — regardless how feeble — to provide a legal basis for the pursuit of fraud analogous to the circumvention provisions of the US DMCA."