You could allow it, but it wouldn't do you any good. How do you trust your estate? Which part of your image will be "protected" and which won't? As a former fellow artist I have issues with IP laws. If you want your songs to be heard than you should stop regarding them as intellectual property. If you want your audience to pay for hearing them, you should not be wondered when they tell you (or pay you) to shut up. People are getting used to the idea that all information is free and privacy is history. So why do we still pay for music? To shift the gems from the garbage heap we will pay a finder's fee and when we're hooked on something we will support that something. The best example I can give is the Kickstarter project by Amanda Palmer which got her 1 million dollar in a week to produce an new album. Crowdfunding is the way to go.