There has been a lot of discussion about this for some time now. You can read all about that here:
http://forum.slysoft.com/showthread.php?t=48789
The easiest solution for the "Cinavia problem" is to use a player which *cannot* play retail Blu-ray discs.
There are some media players which even support full blown Blu-ray menus, like the Netgear NTV550 (not tested myself).
No retail Blu-ray playback = no AACS license required = no Cinavia.
If you can live without full menus, there are many very good and very cheap media players available.
A harddisk as a backup media is cheap & fast.