I don't remember exactly what it said, but the gist was they've used mp4 because it's the most universally usable format. I'm pretty sure it would be OK, I just need the "lifeline" of a response from them. I'm sure I'll hear back from them soon. They want to sell to me as much as I want to buy from them.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper