It "should" be fairly simple to implement a duplicate name check when you upload something - the way sites check to see if your desired user name has been taken already.

IANAL so I don't know if naming something gives you rights to that name, especially for an entirely different product. If you're selling a car named 'Excalibur,' does that mean someone else can't sell a sword by the same name? Whether the store would allow it of course is entirely up to them.  

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken