Actually if you download a game it is still illegal piracy even if you bought the game. Also the forum rules specifically state you're not allowed to talk about downloading games, period. I can almost guarantee that you will be banned soon regardless of if you think you did anything wrong. The rules are the rules.
I didn't post any warez-related links, i just talked about the topic in general, so it's absolutley nothing wrong with that especially as i have the originals laying around here.
And one other example:
Steam works almost the same, you buy or register a normal CD-Key of a game and then you can download it as many times as you want because you own the contents.
Any source on the world is legal, as long as you already own the stuff you are going to get.