I think they have 'strange' stuff at their hentai site...
DOWNLOAD CONDITIONS: You own the actual license version of the episode(s)/movie(s) that you are downloading. If you do not have the actual episode(s)/movie(s) you are downloading, then they must be deleted from your computer within 24 hours. If you enjoy the episode(s)/movie(s), we encourage you to purchase the product(s) from the said makers of the product(s).
More here...
http://www.hentaivideoworld.com/
So they are just showing vids, where they don't have a license for? or?