If you publish an art piece on Deviant Art or on your own blog site, and you ask your viewers not to copy or use your art for any reason, are you being selfish?
Think about it for a moment. If the answer is no, consider this:
This Earth was created by Yahushua Ha'Mashiach or Jesus the Messiah -- being, in all things, Yahweh. True, we helped in its creation, but Yahweh was the one who acted on behalf of God the Creator in order to physically create the world.
Ostensibly, the raw materials of this Earth belongs to him by default. So, by default he is the real owner of the Creation and everything in it. However, he placed us here on this earth and he gave us Dominion over all things pertaining to this Earth; meaning we can hold property belonging to him in the real place.
Let me stress this: He owns everything: Everything above the Earth (the atmosphere), everything on the Earth (except us), everything below the Earth (the natural resources), and everything under the Earth. Yet, he allows us to use the Earth as we see fit even though we were put on this Earth to transform it into a better place for all. He allows us to use the Creation according to our Desires.
Why then, should you ask your fellowmen not to use your creations, which are much more easily copy-able thanks to the Internet, after you publish them? Why publish your creations in the first place if you don't want to your fellowmen to use them? Aren't you effectively stealing your work back?
Are you better than God, who is allowing us to use his creation? Or do you fear your fellowmen? Maybe you fear notoriety? Should you be publishing your work at all?
Just think about that.