The music and movie industries have been combatting digital copying and downloading. Now the porn industry, which has led the web in many of its money-making innovations, is suing to protect its content. Last week adult entertainment businesses sued credit card companies that service websites that offer stolen porn. “The reason it was so hard to make money is because while we were paying for our content, there were many websites out there that were competing against us that were stealing theirs. It’s pretty impossible to compete in that situation.”