There is also another copy protection I once ran into - which made the game completely unplayable for me: Arcanum has such a stupid protection you only can install it from a normal CD-Rom drive. Alas, I have both a CD-writer and a DVD-drive, but not a normal CD-Rom. I bought the game and never could install it...
And while it's annoying to have to wait for the game to check the disk every time I start playing, that's a copy protection I can live with. Any copy protection that doesn't interfere with the actual installing or playing is okay by me.
