<s>
libdvdcss	B-Language
(	O
or	O
libdvdcss2	B-Language
in	O
some	O
repositories	O
)	O
is	O
a	O
free	B-Application
and	O
open-source	B-Application
software	I-Application
library	B-Library
for	O
accessing	O
and	O
unscrambling	O
DVDs	O
encrypted	O
with	O
the	O
Content	B-Algorithm
Scramble	I-Algorithm
System	I-Algorithm
(	O
CSS	O
)	O
.	O
</s>
<s>
libdvdcss	B-Language
is	O
part	O
of	O
the	O
VideoLAN	B-Application
project	O
and	O
is	O
used	O
by	O
VLC	B-Application
media	I-Application
player	I-Application
and	O
other	O
DVD	B-Device
player	I-Device
software	O
packages	O
,	O
such	O
as	O
Ogle	B-Application
,	O
xine-based	O
players	O
,	O
and	O
MPlayer	B-Application
.	O
</s>
<s>
libdvdcss	B-Language
is	O
not	O
to	O
be	O
confused	O
with	O
DeCSS	O
.	O
</s>
<s>
Whereas	O
DeCSS	O
uses	O
a	O
cracked	O
DVD	B-Device
player	I-Device
key	O
to	O
perform	O
authentication	O
,	O
libdvdcss	B-Language
uses	O
a	O
generated	O
list	O
of	O
possible	O
player	O
keys	O
.	O
</s>
<s>
If	O
none	O
of	O
them	O
work	O
(	O
for	O
instance	O
,	O
when	O
the	O
DVD	O
drive	O
enforces	O
region	O
coding	O
)	O
,	O
libdvdcss	B-Language
brute-forces	O
the	O
key	O
,	O
ignoring	O
the	O
DVD	O
's	O
region	O
code	O
(	O
if	O
any	O
)	O
.	O
</s>
<s>
The	O
legal	O
status	O
of	O
libdvdcss	B-Language
is	O
controversial	O
but	O
there	O
has	O
been	O
—	O
unlike	O
DeCSS	O
—	O
no	O
known	O
legal	O
challenge	O
to	O
it	O
as	O
of	O
June	O
2022	O
.	O
</s>
<s>
Many	O
Linux	B-Application
distributions	I-Application
do	O
not	O
contain	O
libdvdcss	B-Language
(	O
for	O
example	O
,	O
Debian	O
,	O
Ubuntu	B-Operating_System
,	O
Fedora	O
and	O
openSUSE	B-Operating_System
)	O
due	O
to	O
fears	O
of	O
running	O
afoul	O
of	O
DMCA-style	O
laws	O
,	O
but	O
they	O
often	O
provide	O
the	O
tools	O
to	O
let	O
the	O
user	O
install	O
it	O
themselves	O
.	O
</s>
<s>
For	O
example	O
,	O
it	O
used	O
to	O
be	O
available	O
in	O
Ubuntu	B-Operating_System
through	O
Medibuntu	B-Application
,	O
which	O
is	O
no	O
longer	O
available	O
.	O
</s>
<s>
Distributions	O
which	O
come	O
pre-installed	O
with	O
libdvdcss	B-Language
include	O
BackTrack	O
,	O
CrunchBang	O
Linux	B-Application
,	O
LinuxMCE	B-Application
,	O
Linux	B-Application
Mint	I-Application
,	O
PCLinuxOS	O
,	O
Puppy	O
Linux	B-Application
4.2.1	O
,	O
Slax	O
,	O
Super	O
OS	O
,	O
Pardus	B-Operating_System
,	O
and	O
XBMC	O
Live	O
.	O
</s>
<s>
It	O
is	O
also	O
in	O
Arch	O
Linux	B-Application
official	O
package	O
repositories	O
.	O
</s>
<s>
Libdvdcss	B-Language
alone	O
is	O
only	O
a	O
library	B-Library
and	O
cannot	O
play	O
DVDs	O
.	O
</s>
<s>
DVD	B-Device
player	I-Device
applications	O
,	O
such	O
as	O
VLC	B-Application
media	I-Application
player	I-Application
,	O
use	O
this	O
library	B-Library
to	O
decode	O
DVDs	O
.	O
</s>
<s>
Libdvdcss	B-Language
is	O
optional	O
in	O
many	O
open-source	B-Application
DVD	B-Device
players	I-Device
,	O
but	O
without	O
it	O
,	O
only	O
non-encrypted	O
discs	O
will	O
play	O
.	O
</s>
