Jeannie, we have on this site threads dedicated to the topic of cinavia.
As it stands now, there is no good way to remove this watermark without a diminished audio.
So if you have a fairly recent blu-ray player, it will detect and mute the audio and there is no way to get around that.
This applies mainly to a backup disc copy made from the original (that contains cinavia).
The best idea is to use equipment that doesn't honor the blu-ray disc license for backup discs.
This can be an older generation blu-ray player or an easier way would be to process the BD files further so that the file can be played back on equipment such as through the usb port.
Many BD players can handle usb files, even though they detect cinavia on disc will let it pass if it is a file.
LG is such a brand, perhaps there are others but there are reports that Sony and possibly Samsung that detect cinavia in file playback.
There are many Media players that can play files, whether BD or dvd.
Some TVs have built-in media players that can play them.
Also there are many people that use a computer to playback files through software players.
Or possibly a new dvd player that upconverts should be able to play them.
(I haven't yet heard of any dvd players that detect cinavia but it is possible for
makers to add detection chips.)
I am just pointing out that even though we don't have a good system yet to remove cinavia, there are plenty of ways to playback the backups using other means.