http://en.wikipedia.org/wiki/Sweepstakes

“Because of their potential for abuse, sweepstakes are heavily regulated in many countries. The U.S., Canada, and individual U.S. states all have laws covering sweepstakes, resulting in special rules depending on where the entrant lives. The U.S. Federal Trade Commission exercises some authority over sweepstakes promotion and sweepstakes scams in the United States.”

While this isn’t a sweepstakes, the same comission also oversees rules and laws about contests and have equally annoying restrictions. Obviously, we would have loved the talent and potential of the international community to work on this.