Purveyors of porn have recently invented a new business plan. Rather than bothering to sell their product, they simply place it on the Internet where it is easy to steal. When you go for the bait, they get your IP. Then their shyster lawyers demand your name from your ISP, then robo-file mass copyright lawsuits. The result? you get a letter demanding immediate cash to make the legal mess go away. You can find many news articles about this mess. Here is
one I learned about this deal from a local paper. Apparently there have been enough local victims to get their attention.
Be careful out there. The Internet is still a bit like the wild-wild west.