I was having this problem too. I had installed CSS , I could see and
browse the DVD, but it wouldn't play.

I could play unencrypted VOBs, but not encrypted ones.

If I did a "Show properties" of an encrypted VOB, Nautilus would crash.

I eventaully traced the problem: no region set on the DVD drive. I was
getting the following messages on dmesg:

 [  167.329314] sr 2:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 02 a2 00 00 02 00
 [  167.329332] end_request: I/O error, dev sr0, sector 2696
 [  167.335004] sr 2:0:0:0: [sr0]  Result: hostbyte=DID_OK 
driverbyte=DRIVER_SENSE
 [  167.335015] sr 2:0:0:0: [sr0]  Sense Key : Illegal Request [current] 
 [  167.335024] sr 2:0:0:0: [sr0]  Add. Sense: Media region code is mismatched 
to logical unit region
 [  167.335035] sr 2:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 02 a2 00 00 02 00
 [  167.335053] end_request: I/O error, dev sr0, sector 2696

Solution: install and use regionset.

Still, this should be fixed centrally: Nautilus shouldn't crash, the
message from mplayer should include the warning that a region code may
not be set.

** Changed in: gstreamer0.10 (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/782411

Title:
  Could not read DVD. This may be because the DVD is encrypted and a DVD
  decryption library is not installed.

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