As an amateur artist, and as I've stated on my deviantART account; I believe that with my art, the only things I own are the credit for making it, any of my physical property that depicts/conveys it, and a "temporary" (I think it's life + 70ish years now) and government-granted exclusive rights over what's done with it, if I don't grant permission. Any other "ownership" is an illusion when I cease to keep it to myself.
"I think we have to stop conceiving of remixing as a kind of theft."
I personally agree with this statement, although especially on deviantART, there's people who have a lot more draconian and different view of this. Just do a search for "art theft" on deviantART and you'll come across a lot of angry rants against it.