New ebook DRM Will Change the Text of a Story to Prevent Piracy

German researchers are working on a new DRM system that would change individual words of a story to track pirated book copies back to their original owners.

"The idea behind SiDiM is similar to the way rights holders have been trying to protect music and video for some time. Instead of trying to lock down copies through technical measures that prevent copying, so-called fingerprinting measures simply add markers to a work that make it possible to identify the original purchaser. In theory, this prevents people from sharing their works for the fear of being caught."

http://paidcontent.org/2013/06/14/new-ebook-drm-will-change-the-text-of-a-story-to-prevent-piracy/