Raising Jake Studios has released Demo Ducker, a plugin that can help protect your work.
Demo Ducker can be used to softly "watermark" your audio tracks with random dips in level that can help prevent others from using your work without your consent. Demo Ducker generates smooth, random dips in mono or stereo audio tracks with user-adjustable controls for period, duration and depth.
Demo Ducker is a 64-bit plugin for Mac and PC. A demonstration video is posted on the company's website.