<s>
Transmission	O
is	O
a	O
BitTorrent	O
client	O
which	O
features	O
a	O
variety	O
of	O
user	O
interfaces	O
on	O
top	O
of	O
a	O
cross-platform	B-Operating_System
back-end	O
.	O
</s>
<s>
Transmission	O
is	O
free	B-Application
software	I-Application
licensed	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
,	O
with	O
parts	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
It	O
supports	O
the	O
Magnet	B-Protocol
URI	I-Protocol
scheme	I-Protocol
and	O
encrypted	B-Protocol
connections	I-Protocol
.	O
</s>
<s>
It	O
allows	O
torrent-file	O
creation	O
and	O
peer	O
exchange	O
compatible	O
with	O
Vuze	B-Application
and	O
μTorrent	B-Application
.	O
</s>
<s>
It	O
also	O
supports	O
automatic	O
port-mapping	O
using	O
UPnP/NAT	O
-PMP	O
,	O
peer	O
caching	O
,	O
blocklists	O
for	O
bad	O
peers	O
,	O
bandwidth	O
limits	O
dependent	O
on	O
time-of-day	O
,	O
globally	O
or	O
per-torrent	O
,	O
and	O
has	O
partial	O
support	O
for	O
IPv6	O
.	O
</s>
<s>
It	O
allows	O
the	O
use	O
of	O
multiple	O
trackers	O
simultaneously	O
,	O
Local	B-Protocol
Peer	I-Protocol
Discovery	I-Protocol
,	O
Micro	B-Protocol
Transport	I-Protocol
Protocol	I-Protocol
( μTP	O
)	O
,	O
and	O
UDP	O
tracker	O
.	O
</s>
<s>
macOS-specific	O
features	O
include	O
Dock	O
and	O
Growl	B-Operating_System
notifications	I-Operating_System
,	O
automatic	O
updates	O
using	O
Sparkle	B-Operating_System
and	O
Universal	B-Operating_System
Binary	I-Operating_System
(	O
up	O
until	O
version	O
2.22	O
)	O
.	O
</s>
<s>
Transmission	O
1.60	O
and	O
later	O
removed	O
support	O
for	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
.	O
</s>
<s>
Currently	O
,	O
Transmission	O
1.54	O
is	O
the	O
last	O
version	O
that	O
runs	O
on	O
Mac	B-Application
OS	I-Application
X	I-Application
10.4	I-Application
.	O
</s>
<s>
Although	O
it	O
is	O
possible	O
to	O
compile	O
later	O
versions	O
from	O
source	O
,	O
either	O
by	O
downloading	O
from	O
the	O
project	O
's	O
website	O
or	O
using	O
a	O
package	O
manager	O
like	O
Fink	B-Application
or	O
MacPorts	B-Application
,	O
it	O
is	O
unsupported	O
and	O
any	O
bugs	O
specific	O
to	O
10.4	B-Application
will	O
not	O
be	O
fixed	O
.	O
</s>
<s>
Starting	O
with	O
Transmission	O
2.30	O
an	O
Apple	O
Mac	O
with	O
an	O
Intel	O
CPU	O
is	O
needed	O
;	O
PowerPC-based	O
systems	O
are	O
no	O
longer	O
supported	O
natively	O
.	O
</s>
<s>
The	O
Transmission	O
back-end	O
(	O
libTransmission	O
)	O
also	O
serves	O
as	O
the	O
basis	O
of	O
the	O
Transmission	O
daemon	B-Operating_System
.	O
</s>
<s>
The	O
daemon	B-Operating_System
supports	O
a	O
web	O
front-end	B-General_Concept
called	O
Clutch	O
.	O
</s>
<s>
Older	O
versions	O
have	O
been	O
ported	O
to	O
form	O
the	O
basis	O
of	O
the	O
update	O
system	O
for	O
the	O
video	O
game	O
Metal	B-Application
Gear	I-Application
Online	I-Application
on	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
as	O
well	O
as	O
the	O
backend	O
for	O
ImageShack	O
's	O
BitTorrent	O
service	O
.	O
</s>
<s>
A	O
portable	O
version	O
is	O
available	O
on	O
PortableApps.com	B-Application
.	O
</s>
<s>
Transmission	O
is	O
a	O
set	O
of	O
lightweight	O
BitTorrent	O
clients	O
(	O
in	O
GUI	B-Application
,	O
CLI	O
and	O
daemon	B-Operating_System
form	O
)	O
.	O
</s>
<s>
All	O
its	O
incarnations	O
feature	O
a	O
very	O
simple	O
,	O
intuitive	O
interface	O
on	O
top	O
on	O
an	O
efficient	O
,	O
cross-platform	B-Operating_System
back-end	O
.	O
</s>
<s>
There	O
are	O
several	O
transmission	O
clients	O
for	O
different	O
operating	O
systems	O
including	O
Unix-like	B-Operating_System
,	O
macOS	B-Application
and	O
BeOS/ZETA	O
.	O
</s>
<s>
Each	O
operating	O
system	O
front-end	B-General_Concept
is	O
built	O
using	O
native	O
widget	B-Library
toolkits	I-Library
.	O
</s>
<s>
For	O
example	O
,	O
transmission-gtk	B-Language
uses	O
the	O
GTK	B-Application
interface	O
,	O
transmission-qt	O
the	O
Qt	B-Language
interface	O
,	O
and	O
transmission-cli	O
a	O
command-line	B-Application
interface	I-Application
.	O
</s>
<s>
Transmission-remote-cli	O
is	O
an	O
ncurses	B-Language
interface	O
for	O
the	O
transmission-daemon	O
.	O
</s>
<s>
Python-transmissionrpc	O
is	O
a	O
Python	O
module	O
implementing	O
the	O
JSON-RPC	B-General_Concept
protocol	O
for	O
Transmission	O
.	O
</s>
<s>
An	O
unofficial	O
port	O
of	O
Transmission	O
using	O
a	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
on	O
iOS	B-Operating_System
was	O
accomplished	O
on	O
3	O
March	O
2008	O
.	O
</s>
<s>
In	O
November	O
2010	O
,	O
iTransmission	O
,	O
another	O
unofficial	O
port	O
,	O
was	O
released	O
for	O
jailbroken	O
iPhones	O
sporting	O
a	O
GUI	B-Application
that	O
is	O
capable	O
of	O
downloading	O
directly	O
to	O
the	O
device	O
over	O
WiFi	O
or	O
3G	O
.	O
</s>
<s>
A	O
Transmission	O
remote	O
was	O
released	O
for	O
Android	B-Application
,	O
with	O
the	O
name	O
of	O
Transdroid	O
but	O
does	O
not	O
currently	O
support	O
downloading	O
directly	O
to	O
devices	O
.	O
</s>
<s>
On	O
Windows	B-Application
,	O
Transmission-Qt	O
can	O
be	O
built	O
with	O
MinGW	B-Application
,	O
the	O
daemon	B-Operating_System
and	O
console	O
tools	O
can	O
be	O
built	O
with	O
Cygwin	B-Language
,	O
also	O
there	O
are	O
two	O
third-party	O
GUIs	B-Application
:	O
transmission-remote-dotnet	O
and	O
Transmission	O
Remote	O
GUI	B-Application
,	O
as	O
well	O
as	O
unofficial	O
full	O
builds	O
of	O
Transmission	O
's	O
Qt	B-Language
Client.	O
,	O
There	O
is	O
also	O
an	O
unofficial	O
full	O
build	O
of	O
Transmission	O
daemon	B-Operating_System
which	O
can	O
be	O
run	O
as	O
a	O
Windows	B-Application
service	O
.	O
</s>
<s>
This	O
same	O
unofficial	O
full	O
build	O
of	O
Transmission	O
daemon	B-Operating_System
running	O
as	O
a	O
Windows	B-Application
service	O
can	O
be	O
used	O
for	O
direct	O
streaming	O
of	O
the	O
downloading	O
file(s )	O
.	O
</s>
<s>
A	O
port	O
for	O
all	O
platforms	O
enhanced	O
with	O
streaming	O
of	O
the	O
downloading	O
file(s )	O
is	O
located	O
on	O
GitHub	B-Application
.	O
</s>
<s>
It	O
is	O
also	O
ported	O
to	O
the	O
Maemo	B-Operating_System
OS	I-Operating_System
of	O
the	O
Nokia	B-Language
N810	I-Language
internet	O
tablet	O
and	O
N900	B-Application
smartphone	O
as	O
well	O
as	O
to	O
the	O
MeeGo/Harmattan	O
OS	O
of	O
the	O
Nokia	B-Operating_System
N9	I-Operating_System
and	O
N950	B-Language
smartphones	O
,	O
on	O
which	O
it	O
does	O
download	O
the	O
torrents	O
to	O
the	O
device	O
.	O
</s>
<s>
In	O
March	O
2016	O
,	O
Palo	O
Alto	O
Networks	O
reported	O
that	O
Transmission	O
's	O
official	O
website	O
was	O
compromised	O
and	O
tainted	O
.dmg	B-Operating_System
files	O
were	O
uploaded	O
to	O
the	O
site	O
,	O
using	O
an	O
Apple	B-Operating_System
Developer	I-Operating_System
signature	O
to	O
bypass	O
the	O
OS	O
X	O
gatekeeper	B-Operating_System
feature	O
.	O
</s>
<s>
The	O
tainted	O
packages	O
installed	O
a	O
ransomware	O
application	O
(	O
a	O
variant	O
of	O
Linux.Encoder.1	O
,	O
but	O
recompiled	O
for	O
Mac	O
,	O
known	O
as	O
KeRanger	O
)	O
that	O
encrypts	O
the	O
user	O
's	O
files	O
and	O
attempts	O
to	O
force	O
users	O
to	O
pay	O
1	O
Bitcoin	B-Protocol
(	O
worth	O
roughly	O
US$404	O
at	O
the	O
time	O
of	O
the	O
attack	O
)	O
in	O
order	O
to	O
get	O
the	O
decryption	O
pack	O
.	O
</s>
<s>
Apple	O
revoked	O
the	O
developer	O
certificate	O
that	O
was	O
used	O
to	O
sign	O
the	O
tainted	O
package	O
,	O
and	O
added	O
the	O
package	O
's	O
signature	O
to	O
the	O
XProtect	B-Operating_System
anti-malware	O
system	O
.	O
</s>
<s>
Transmission	O
is	O
the	O
default	O
BitTorrent	O
client	O
of	O
many	O
Unix	B-Application
and	O
Linux	B-Application
distributions	I-Application
,	O
including	O
Ubuntu	B-Operating_System
,	O
Mint	B-Application
,	O
Fedora	O
,	O
Puppy	O
,	O
Zenwalk	O
,	O
and	O
the	O
GNOME	B-Application
flavor	O
of	O
openSUSE	B-Operating_System
.	O
</s>
