We knew they cared about their IP, but the linking policy of the Frauenhofer Institute (of mp3 fame) is particularly lame:

The contracting party shall inform the Fraunhofer-Gesellschaft that the link has been inserted, or that the target page has been installed on a webserver, by sending an e-mail message to info@fraunhofer.de within 24 hours of setting the link. This message must contain the path (URL) via which the webpage containing the link can be accessed.

You must be joking. If course, they're not exactly the only ones joking. In Denmark the courts are famously joking along.

Some time real soon this idea that you have any right to define how others link to your websites must be stopped.