No, it is not reverb that is used in cinavia but according to one poster there is a phase shift going at ~ 7khz and above.
Yet it is much more than that (even if that's true) since a handheld video cam. will pick up the protection from a distance.
Since that is true and has long been confirmed, cinavia is well within the hearing range probably based on psychoacoustics...which means it is embedded and without carefully trying to find, is almost impossible to hear.
According to cinavia official source information, it uses broad spectrum dispersion techniques.
However, if my suspicions are correct, it is much simpler than all that.
So far using the usual means of masking it involves reverb and EQ attenuation (mostly limiting the higher frequencies).
The reason reverb (even though it is the method mostly used) is not exactly ideal way of dealing with masking it is due to the fact that it is very difficult to control which frequency ranges are affected.
Higer levels of reverb returns of the lower mid-range and low frequencies produces unpleasant results.
Then if those are limited too much, it produces a thin tinny sound that is just as displeasing.
It is a balancing act that can't be controlled, at least using common editing programs.
If my theory is correct, it would be impossible to remove cinavia without doing serious damage to the audio--so much so that no one would want to listen to it.
It's kind of like an egg that has been scrambled...impossible to make it a raw egg again.
The only means left would be for a programmer that knew exactly what to look for and produce that program that could "hunt" all cinavia signals and add to them so that the detection method wouldn't be able to recognize the information needed to determine cinavia's presence.
If my memory serves me correct, the company that created cinavia had about 10 years(actually started in 1999) to work on the method...possibly a form of it was used for the not so popular dvd-audio format? Not sure about that but probably something similar.
The masking techniques using reverb amounts to "thickening" the audio stream...slurring it to the extent in order to not allow the cinavia detection from locking on to the embedded signal.
This form of masking will always cause loss of definition to the original audio.
It takes a goodly amount of reverb ms. to allow for the masking.
If one wonders why the sound isn't that good from the results of reverb, etc, realize that the sound has to be "screwed-up" that "badly" in order for cinavia not to be detected.
Cinavia is an incredible drm...personally I think the embedding process degrades the audio...and if DVDRanger's "levels" are correct and the information is too that the newest releases this year use a lower level of cinavia...I would think that is evidence enough.