If it has a program guide then it probably has parental controls. I doubt it would have parental controls if it doesn't have a program guide, as the rating information comes from the guide. I bet MythTV has it, but you said you don't want MythTV (which I haven't gotten working anyways). I don't have my TV tuner hooked up to our TV line, I just use it (as well as my TV) to play games (yeah, I'm not much of a TV watcher). I'll need to try this TVTime thing, as I haven't found any good Linux TV tuner/capture card programs.