How can I download games from MLB.TV? Is it even possible to do it?

Is it possible to download complete games from MLB.TV? It must be, because I’ve seen downloads on You Tube from users other than MLB. When I do a Google search asking how to do it, I see links to various third-party software programs that I can buy but I don’t know if they’re any good or legit or anything like that.

So, I guess my question is two-fold: Is it possible to download complete games from MLB.TV, and if it is, how do I do it?

Thanks!