You would have to be more specific to determine what legal boundaries you may cross. are you planning to be associated with youtube? In term of "download", are you downloading copyrighted material? like the old saying goes. its only illegal if and when you get caught.
i don't get it too, why should i download off some other site, when i can download directly from youtube or if you are planning on embedding youtube vids on your site which is fair game if the vid comes with embedding option . and if is uploaded by the copy right holder or with their permission, but in reality nobody gives a hoot about that.
@allthatjazz this is the second post i have seen today of yours that is so full of crap its unbeleivable. Your are encouraging people to act like morons and do things that are by definition illegal, whether YOU like it or not.
Maybe that would be better written as "it's illegal AND THEN you get caught" Many people do illegal things for money but when you're willing to break the Law for no gain then it requires a special kind of stupidity - not that I'm implying that you should break the Law at all. Check out the T&Cs of YouTube. I imagine they allow some sort of linking or embedding of their videos in other sites but you need to check out the intricacies with them. I don't think "downloading" is something they will allow, and since Bulgaria is now part of the European Union don't be surprised if you find an American policeman outside your door arresting you in your own country and flying you back to the USA if you do decide to do it illegally.
Sounds like a waste of a site. There are a few out there like keepvid.com I believe. And i doubt its illegal but still kind of needless
YouTube has sued at least one of these sites before. My advice is to focus on a project with more of an upside instead. This YouTube downloader stuff is for noobs.