Gogall -
Thanks for your note; we’ll look into that a bit more.
Responding to a couple of your points or questions, all of our Marketplace developers need to have the rights to the Marketplace assets they want to sell before we can sell them; it’s part of the agreement to sell.
Also, while not directly related to your question, just because something is on YouTube doesn’t make it public domain (i.e., anyone is free to use).