"When buying a software second hand, you have to get the handbook also. It is completely illegal to sell a software that is not 100% complete. "

No, that's nonsense. If you tell someone "I have the CD's but I can't find the manual" there is nothing wrong with that, its up to the buyer to decide if he wishes to buy it. I find it very unlikely there would be laws anywhere to impose the peculiar restriction you talk about.