<s>
Ubuntu	B-Operating_System
Restricted	I-Operating_System
Extras	I-Operating_System
is	O
a	O
software	B-Application
package	I-Application
for	O
the	O
computer	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
Ubuntu	B-Operating_System
that	O
allows	O
the	O
user	O
to	O
install	O
essential	O
software	O
which	O
is	O
not	O
already	O
included	O
due	O
to	O
legal	O
or	O
copyright	O
reasons	O
.	O
</s>
<s>
The	O
software	O
in	O
this	O
package	O
is	O
not	O
included	O
in	O
Ubuntu	B-Operating_System
by	O
default	O
,	O
as	O
Ubuntu	B-Operating_System
maintainers	O
wish	O
to	O
include	O
only	O
completely	O
free	B-Application
software	I-Application
in	O
out-of-the-box	O
installations	O
.	O
</s>
<s>
Included	O
packages	O
may	O
be	O
closed-source	B-Application
,	O
encumbered	O
by	O
software	O
patents	O
,	O
or	O
otherwise	O
restricted	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
Adobe	B-Operating_System
Flash	I-Operating_System
plugin	I-Operating_System
is	O
a	O
closed-source	B-Application
piece	O
of	O
software	O
.	O
</s>
<s>
Additionally	O
,	O
many	O
multimedia	O
formats	O
such	O
as	O
MP3	B-Application
and	O
H.264	B-Application
are	O
patented	O
.	O
</s>
<s>
The	O
Ubuntu	B-Operating_System
Restricted	I-Operating_System
Extras	I-Operating_System
is	O
a	O
metapackage	B-Application
and	O
has	O
the	O
following	O
dependencies	O
:	O
</s>
<s>
Starting	O
with	O
Ubuntu	B-Operating_System
10.10	O
,	O
several	O
of	O
these	O
dependencies	O
are	O
included	O
indirectly	O
via	O
another	O
meta-package	O
ubuntu-restricted-addons	O
which	O
is	O
included	O
by	O
default	O
.	O
</s>
<s>
Due	O
to	O
the	O
legal	O
status	O
of	O
the	O
software	O
included	O
in	O
Ubuntu	B-Operating_System
Restricted	I-Operating_System
Extras	I-Operating_System
,	O
the	O
package	O
is	O
not	O
included	O
by	O
default	O
on	O
any	O
Ubuntu	B-Operating_System
CDs	O
.	O
</s>
