We don't support piracy and always encourage you to support the industry and buy your sources. Go with the dvd sources. Sources you buy (DVD/Bluray) have always higher quality than pirated footage so go with the DVDs. As said in the website rules:
viewtopic.php?f=14&t=289What do I do with the iso?
You mount it in Deamon Tools and than you follow this guide to get the maximum quality possible and the least trouble when working with DVDs:
http://www.animemusicvideos.org/guides/avtech3/How can I make the dvd footage 1080p etc?
It's not a good idea. You can upscale it with various filters and stuff, but in the end: You can't create details that don't exist in the small ressolution. Think about it. DVDs are only 480p. The easiest way to upscale is just to play them in full screen. Encoding and editing dvds in 1080p makes therefor no sense.
Should I ask him to get dvd9 or dvd5 of the dvd? Because I dunno whats the difference :S
Bought dvds are most of the time dvd9. They are double layer dvds and have probably a higher bitrate. So if you buy a dvd they are most of the time dvd9. Tell him to buy the dvds and you're fine with it.