I'm not trying to break protocol and encourage theft. This is a serious question.

They have extended "previews" usually from 6-12 minutes of internet porn scenes like Mr. Big Dicks, Naughty America, et al. At which point it seems to me its not a preview anymore. You can click on the link to join the site, but that seems unlikely if there are essentially giving the product away. I can't imagine they could do this without the consent of the materials true owners. How is this a good idea?