I just noticed this discussion over at the Slysoft forum, and by extension, at the Arcsoft forum as well. http://forum.slysoft.com/showthread.php?t=55474
It seems that if you are using an original disc and have AnyDVD HD running in the background, playing the disc with a licensed software player like Arcsoft TMT 5 will cause the Cinavia warning to pop up. Of course, this only happens with discs that have Cinavia in them, but it is yet another annoyance in trying to play back your original material.
My copy of TMT 5 is an early one, before the addition of Cinavia, and I refuse to update it, so I have never seen this.