Hello and welcome! You're in the right place. Nice username.
I've heard of some people pirating these, but I really don't want to steal something that has had so much time and love put into it. So...what do I do?
I'm not sure I understand what you're saying. You mean you want to watch the Despecialized but you don't wanna "pirate" it? You can't buy these. Do you know how to download from a torrent site? That's one of the options. There's more but I'm not that good at explaining, I'll let the regulars fill you in on this.
As for you last question, short answer, you can watch it on your computer. It won't work on a regular dvd player, wrong format.