Usually you're not allowed to scan copyrighted material like that to post on the internet or something. Lots of games are made with Maya: pretty much anything from Lucasarts, at least, because I know they use Maya. Extracting the models is tough, and usually only works if the developers have provided an SDK, or Software Development Kit. The models are super duper mega high poly because those will be converted into normal maps that will be placed on the lower poly models.