I had a professor who has all of his work available on his website and allows anyone to use it as long as they retain credit for him in some part of their work. His philosophy was always that "if work was being shown, it was being shown, and that was all that mattered". Of course, he was also earning money as a professor so his art was not his only means of income.
I've always agreed with him in some form, as an artist, our ultimate goal has been getting our work out there, having people experience it. However as things have evolved in our society, you cannot simply support yourself off of fame alone, or can we? Or can you use fame to create wealth? A simple example is 'reality tv' stars. Many of these people were normal unknown people and once put on TV were offered other opportunities and ways to make a living or income based solely off of their fame.
I think the interesting cross roads we have reached. Nothing is truly original anymore, and everything is drawn from something or somewhere no matter how abstract a form. So how do we give credit where its due and how to we take a copy of the copies of the copies and make it our own (without creating lawsuits or being accused of plagiarism in the artistic arena)?
Many of the issues at hand have more recently become issues as we have become somewhat of a 'free trade' society with peer to peer software being introduce into the mainstream culture. The availability of media has become easy for anyone to obtain just about anything within a few seconds depending on the speed on an internet connection.
At some point our society will need to define boundaries or develop new ways of using medias to allow artist to make a living or just make free art although I don't feel I have the soultion, it will be interesting to see what is proposed.