Turn off DVD CSS authentication

[Eric Battersby]

How does one turn off DVD CSS authentication temporarily?
I cannot play a non-encrypted DVD without jumping thru hoops.

To me, this seems like a bug, because libdvdread should fall
back to no CSS authentication instead of failing.


## THIS FAILS:
  # mount /dev/dvd /mnt/dvd
  $ mplayer dvd://2 -dvd-device /mnt/dvd
  ...
  libdvdread: Using libdvdcss version 1.2.10 for DVD access
  libdvdread: Attempting to use device /dev/scd0 mounted
              on /mnt/dvd for CSS authentication
  libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed


## WORK AROUND:  this works (but produces many warnings):
  # chmod 000 /dev/dvd
  $ mplayer dvd://2 -dvd-device /mnt/dvd
  ...
  libdvdread: Using libdvdcss version 1.2.10 for DVD access
  libdvdread: Attempting to use device /dev/scd0 mounted
              on /mnt/dvd for CSS authentication
  libdvdread: Could not open /dev/scd0 with libdvdcss.
  libdvdread: Can't open /dev/scd0 for reading
  libdvdread: Device /dev/scd0 inaccessible, CSS authentication not available.
  *** Zero check failed in libdvdread4/ifo_read.c:518
      for vmgi_mat->zero_3 = 0x00000000010000000000000000000000000000
  ...
  *** libdvdread: CHECK_VALUE failed in libdvdread4/nav_read.c:264 ***
  *** for dsi->dsi_gi.zero1 == 0 ***
  ...
  A:   0.4 V:   0.2 A-V:  0.169 ct:  0.003   2/  2 ??% ??% ??,?% 0 0
  *** libdvdread: CHECK_VALUE failed in libdvdread4/nav_read.c:264 ***
  *** for dsi->dsi_gi.zero1 == 0 ***

  A:   0.9 V:   0.9 A-V:  0.017 ct:  0.066  23/ 23 19% 14%  1.5% 1 0
  *** libdvdread: CHECK_VALUE failed in libdvdread4/nav_read.c:264 ***
  *** for dsi->dsi_gi.zero1 == 0 ***

  A:   1.4 V:   1.4 A-V:  0.008 ct:  0.082  38/ 38 18%  8%  1.3% 1 0
  *** libdvdread: CHECK_VALUE failed in libdvdread4/nav_read.c:264 ***
  *** for dsi->dsi_gi.zero1 == 0 ***
  ...
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