ANN reports (or reported about a week ago) that Leaf, a Hentai Game maker, has been forced to release the source code for four of their games, including ToHeart2 XRATED:
This was because Leaf had used the XVid video codec inside their games. XVid is licensed under the GNU Public Library (GPL). When software using GPL licensed code is released to the public, the GPL requires that the source code be made available to the programs users. For a ¥600 shipping and handling fee, Leaf will ship a copy of the code to anyone who requests it.
Quite a loophole, eh? So for about $5 (probably in Japan only), you can get a whole Hentai Game engine!
Saint Michael the Archangel,
defend us in battle.
Be our protection against the wickedness and snares of the devil.
May God rebuke him, we humbly pray;
and do Thou, O Prince of the Heavenly Host -
by the Divine Power of God -
cast into hell, satan and all the evil spirits,
who roam throughout the world seeking the ruin of souls.