I don't interpret either section 2 or 3 of the GFDL such that they would require you to physically attach the license text to the mouse pad. The purpose of the requirement to publish a copy of the license together with any copy of the licensed work is to make sure, the person who receives the copy knows about her rights. The GFDL gives no reason to assume a different interpretation of this requirement. If you put a copy of the license into the box, this purpose is perfectly fullfilled. At least, this is how I think the license is to be interpreted in Germany. If there are front or back cover texts, this is a different story, of course.

Squeezing the GFDL onto an A4 page is possible if you use a sufficient amount of force. I have arranged a squeeze-version in LaTeX format once, in case you have interest.

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