Where can I find logic problems without copyright?
Depends on the usage. If you don’t want to make a profit out of it, check http://www.puzzlersparadise.com/ PuzzlersParadise welcomes you to delight in our collection of mind boggling puzzles. We are devoted to providing puzzle enthusiasts of all ages challenging and fun puzzles. So put on your thinking cap and get puzzling! (Permission is granted for personal use of the material found on this site. The materials on this site may not be duplicated for personal profit. Material noted to be by a different author is copyrighted by that individual.) http://www.iriddler.com/ http://www.puzzles.com/ These sites all state they have copyright, but the provided puzzles are so generally known (especially on iriddler), that using them should not cause a problem.
