<s>
The	O
M4V	B-Application
file	O
format	O
is	O
a	O
video	O
container	O
format	O
developed	O
by	O
Apple	O
and	O
is	O
very	O
similar	O
to	O
the	O
MP4	O
format	O
.	O
</s>
<s>
The	O
primary	O
difference	O
is	O
that	O
M4V	B-Application
files	O
may	O
optionally	O
be	O
protected	O
by	O
DRM	O
copy	B-Application
protection	I-Application
.	O
</s>
<s>
Apple	O
uses	O
M4V	B-Application
to	O
encode	O
video	O
files	O
in	O
its	O
iTunes	B-Operating_System
Store	O
.	O
</s>
<s>
Unauthorized	O
reproduction	O
of	O
M4V	B-Application
files	O
may	O
be	O
prevented	O
using	O
Apple	O
's	O
FairPlay	B-Operating_System
copy	B-Application
protection	I-Application
.	O
</s>
<s>
A	O
FairPlay-protected	O
M4V	B-Application
file	O
can	O
only	O
be	O
played	O
on	O
a	O
computer	O
authorized	O
(	O
using	O
iTunes	B-Operating_System
)	O
with	O
the	O
account	O
that	O
was	O
used	O
to	O
purchase	O
the	O
video	O
.	O
</s>
<s>
In	O
QuickTime	B-Application
,	O
M4V	B-Application
videos	O
using	O
FairPlay	B-Operating_System
DRM	I-Operating_System
are	O
identified	O
as	O
"	O
AVC0	O
Media	O
"	O
.	O
</s>
<s>
Besides	O
Apple	B-Operating_System
iTunes	I-Operating_System
and	O
the	O
Apple	B-Application
QuickTime	I-Application
Player	O
,	O
M4V	B-Application
files	O
can	O
also	O
be	O
opened	O
and	O
played	O
with	O
Media	B-Language
Player	I-Language
Classic	I-Language
,	O
K-Multimedia	B-Application
Player	I-Application
,	O
RealPlayer	B-Application
,	O
Zoom	O
Player	O
,	O
VLC	B-Application
media	I-Application
player	I-Application
,	O
MPlayer	B-Application
,	O
DivX	O
Plus	O
Player	O
,	O
and	O
Nero	B-Application
Showtime	I-Application
(	O
included	O
with	O
Nero	B-Application
Multimedia	I-Application
Suite	I-Application
)	O
.	O
</s>
<s>
The	O
format	O
without	O
DRM	O
can	O
also	O
be	O
played	O
in	O
the	O
webOS	B-Operating_System
Video	O
Player	O
for	O
use	O
on	O
the	O
Palm	B-Application
Pre	I-Application
,	O
Palm	B-Application
Pixi	I-Application
smartphones	B-Application
.	O
</s>
<s>
It	O
is	O
also	O
playable	O
by	O
the	O
Android	B-Application
operating	I-Application
system	I-Application
with	O
its	O
video	O
player	O
.	O
</s>
<s>
It	O
is	O
used	O
as	O
the	O
default	O
video	O
conversion	O
format	O
for	O
HandBrake	B-Language
and	O
Air	O
Video	O
Server	O
on	O
the	O
Macintosh	B-Device
.	O
</s>
<s>
Some	O
other	O
video	O
players	O
can	O
also	O
recognize	O
and	O
play	O
M4V	B-Application
files	O
if	O
the	O
file	O
extension	O
is	O
changed	O
from	O
"	O
.m4v	B-Application
"	O
to	O
"	O
.mp4	O
"	O
.	O
</s>
<s>
HandBrake-produced	O
M4V	B-Application
files	O
can	O
also	O
be	O
played	O
on	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
with	O
full	O
Dolby	O
Digital	O
5.1	O
surround	O
support	O
.	O
</s>
