Digitale Wasserzeichen für textuelle Informationen

Digital watermarking has become an accepted alternative to digital rights management in the area of multimedia copyright protection. But while watermarking is well established for images, video as well as audio, textual documents are still a challenge. We discuss a number of existing approaches for embedding individual watermarks into documents, including format-based strategies as well as natural language watermarking. For the latter we introduce our own approaches, utilizing the few degrees of freedom the German language offers.