I have looked for an answer everywhere for this problem. I have found what people claim as a fix only to learn you still need to adjust things 3-4 times for every movie that gives the Cinavia warning. I have also came across paid software that claims to fix it but have only read that the software you buy is a scam.
It doesn't happen on every movie but most do have it. I'm using PS3 Media Server for the streaming from PC to PS3. I do have a HDMI cable going from my computer to my TV screen but I would like to have my second monitor back and from what I know you need 2 video cards to run 3 monitors. Anyway. that isn't an option I'm willing to do.
Does anyone have a fix or a permanent work around to Cinavia using an up to date PS3.