you can't completely stop piracy. Actually, I think those that try the hardest actually get more attention from the pirates since they see it as a fun game to overcome the complex mechanisms some ip owners have put on the content. Even if you can make vcrs, blue ray recorders, etc. not work, there's always someone aiming a camcorder at the tv...
http://forums.roku.com/viewtopic.php?f=28&t=46566&p=359897#p359897 -channel lists/tools
http://forums.roku.com/viewtopic.php?f=28&t=63553&p=409506#p409506 -fta
http://forums.roku.com/viewtopic.php?f=28&t=64096 -linear channels