There's a Google tech talk with Dr. D. Richard Hipp* (the primary author of SQLite), and he mentions that his decision to release SQLite under the public domain (for simplicity's sake) had surprising consequences -- in his words, the public domain doesn't exist for software in Europe, and several EU companies decided it would be prudent to pay a nominal fee in exchange for a custom, perpetual license from him.

IANAL, etc., but that's a lead if you want to investigate further. (He didn't specify what countries in Europe, but strongly implied it was the case throughout.)

* http://video.google.com/videoplay?docid=-5160435487953918649