This maybe part of a larger enforcement. I had been keeping track of full versions of any of the movies found on public video hosting sites (http://originaltrilogy.com/forum/topic.cfm/Movie-Full-Active/post/469897/#TopicPost469897) and many of them are now gone.
That doesn't explain how 'Han shot first' got picked up in the mix. But it is a sign they are clamping down post BD / pre 3D.