"I urge you not to enter into further contracts with Xe and to immediately review any existing contracts, " the letter said, according to a copy provided to CNN.

CNN: Congresswoman: U.S. ties with Xe, formerly Blackwater, must end

One copy of Spider-Man 2 was purchased to check its quality - and another was immediately produced by one of the traders to take its place on the blanket.

BBC: NEWS | Entertainment | Tracking down the pirate DVDs