I can't tell you how many beginners I've seen build footprints for DB-style
connectors and figure that .1" is close enough (and on their grid) to the true
.109" spacing that they'd just go with it... (And with enough of a
ham-firsted approach, even a DB-25 can be made to fit in .1"-spaced holes!)
Just because a licence says something doesn't mean it has any legal
force. In the specific case of reverse engineering, many countries
have laws specifically allowing it for certain purposes (e.g. to create
interoperable products).
Did they really have the rights to reproduce an image of Waldo? I
wonder how many copies they made? If they get sued and have to pay a
per-copy royalty or penalty, it could get expensive...