I don't think, they can "detect" if someone recorded it using a screen recorder.
But, the legality of it, might be an issue though, and may not serve in the best interest of people who don't want it to be copied.
In another words, it's p1r@cy. And one thing which you can infer is, you can't use the video which you record for any kind of commercial use. For eg, in a blog.