Cinavia at different playback speeds...

[TheBeardedMann]

So, at 1.5x playback, Cinavia is not detected. Has anyone tried to create a video recorded at 1.1x speed and see if Cinavia is activated? It would be nice to see at what 1.?x Cinavia is bypassed. Or maybe even slowed down. Or what about recording the same audio out of phase, then layering it on top of the original. Wonder if that would still activate Cinavia. Could possibly give better insight into a solution. I'm really curious about a work around or fix.

[jman98]

The speed "solution" is a non-starter for a lot of people. Don't expect much interest in that idea, even if it does work.

Here's another awful "solution" that may work (I have not tried so I cannot swear that it works) where the solution is so bad that few will be willing to do it. This is somewhat related to your "out of phase" question.
https://forum.videohelp.com/threads/357132-Cinavia-removal-technique

At this point I believe that there will likely never be an effective solution unless someone is somehow able to access secret materials related to how it is created and even that may not be sufficient to remove it without resorting to audio quality destroying methods. If the obviously lowered audio quality doesn't stop people, then Hollywood will likely resort even more drastic measures such as video steganography. It may end up some years from now that the only way to "get rid" of this kind protection results in videos that look like they were recorded in MPEG-1 at bit rates of 100 Kbps with audio that sounds like it was recorded at 11 Khz and 32 Kbps.

[TheBeardedMann]

I was thinking about the "speed" solution more of a learning experience. Assuming Cinavia is like Morse Code (after so many ticks in the movie, it activates), if you speed up the movie, and find the point at which it de-activates, could you possibly find out how long the Cinavia "tick" lasts? And then with that info, figure out a solution to de-activating it by adding ticks or something? I'm just throwing out ideas.
I ran into Cinavia trying to put all of my daughter's movies on her PS3. A Bluray disc lasts about a week in our house before my three year old uses them to slide on. So I thought, I'll put every movie (and I paid for them) on the PS3 and never worry about it. And yes I know about streaming. And yes I know about the "Digital Copy." I just want to make my own .mp4 of a movie I bought, put it on her PS3, never worry about it again.

[jman98]

Well, if you just simply don't buy any Sony BluRay discs, then the odds you ever encountering Cinavia are very low, with the exception of a very small number of blockbuster movies on Warner Brothers. Depending on what you are buying, you may be worried about nothing.

I don't criticize you for asking questions like this as I think this kind of thing needs to be done, but the geniuses at Doom9 have been working on Cinavia for some time and my gut feeling is that they would have done your suggestion already.