Some parts of copyright law are just downright stupid. For example, if I make a video of my baby reacting to TV or music playing on the radio, I may not be able to make that video/audio available online (on, e.g., YouTube) due to potential copyright infringement. This could be a problem for many parents and others.
Thus I propose the following: build a browser plugin that will take the potentially infringing audio stream (or any stream for that matter) and scramble it via encryption or any other method prior to upload. This should make infringement detection very difficult if not impossible. Then, the plugin will decrypt the audio stream as the video is played back. Sharing can be accomplished in a way that allows the decryption key to be safely passed between plugin users.