<s>
BitTorrent	B-Protocol
is	O
a	O
proprietary	B-Application
adware	O
BitTorrent	B-Protocol
client	B-Protocol
developed	O
by	O
Bram	O
Cohen	O
and	O
Rainberry	O
,	O
Inc	O
.	O
used	O
for	O
uploading	B-Application
and	O
downloading	B-Application
files	O
via	O
the	O
BitTorrent	B-Protocol
protocol	I-Protocol
.	O
</s>
<s>
BitTorrent	B-Protocol
was	O
the	O
first	O
client	B-Protocol
written	O
for	O
the	O
protocol	O
.	O
</s>
<s>
Since	O
version	O
6.0	O
the	O
BitTorrent	B-Protocol
client	B-Protocol
has	O
been	O
a	O
rebranded	O
version	O
of	O
μTorrent	B-Application
.	O
</s>
<s>
As	O
a	O
result	O
,	O
it	O
is	O
no	O
longer	O
open	B-Application
source	I-Application
.	O
</s>
<s>
It	O
is	O
currently	O
available	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
Mac	B-Application
,	O
Linux	B-Application
,	O
iOS	B-Application
and	O
Android	B-Application
.	O
</s>
<s>
There	O
are	O
currently	O
two	O
versions	O
of	O
the	O
software	O
,	O
"	O
BitTorrent	B-Protocol
Classic	O
"	O
which	O
inherits	O
the	O
historical	O
version	O
numbering	O
,	O
and	O
"	O
BitTorrent	B-Protocol
Web	O
"	O
,	O
which	O
uses	O
its	O
own	O
version	O
numbering	O
.	O
</s>
<s>
Programmer	O
Bram	O
Cohen	O
designed	O
the	O
protocol	O
in	O
April	O
2001	O
and	O
released	O
a	O
first	O
implementation	O
of	O
the	O
BitTorrent	B-Protocol
client	B-Protocol
on	O
2	O
July	O
2001	O
.	O
</s>
<s>
It	O
is	O
now	O
maintained	O
by	O
Cohen	O
's	O
company	O
BitTorrent	B-Protocol
,	O
Inc	O
.	O
</s>
<s>
Prior	O
to	O
version	O
6.0	O
,	O
BitTorrent	B-Protocol
was	O
written	O
in	O
Python	B-Language
,	O
and	O
was	O
free	B-Application
software	I-Application
.	O
</s>
<s>
Versions	O
up	O
to	O
and	O
including	O
3.4.2	O
were	O
distributed	O
under	O
the	B-License
MIT	I-License
license	I-License
.	O
</s>
<s>
The	O
source	O
code	O
for	O
versions	O
4.x	O
and	O
5.x	O
was	O
released	O
under	O
the	O
BitTorrent	B-License
Open	I-License
Source	I-License
License	I-License
,	O
a	O
modified	O
version	O
of	O
the	O
Jabber	B-Protocol
Open	B-Application
Source	I-Application
License	O
.	O
</s>
<s>
Versions	O
4.0	O
and	O
5.3	O
were	O
relicensed	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
Version	O
4.20	O
of	O
the	O
client	B-Protocol
was	O
dubbed	O
Allegro	O
by	O
BitTorrent	B-Protocol
Inc.	O
,	O
in	O
reference	O
to	O
protocol	O
extensions	O
developed	O
by	O
the	O
company	O
to	O
accelerate	O
download	B-Application
performance	O
and	O
ISP	O
manageability	O
.	O
</s>
<s>
Version	O
5.30	O
of	O
the	O
client	B-Protocol
which	O
is	O
snapshotted	O
at	O
Internet	O
Archive	O
is	O
the	O
latest	O
open	B-Application
source	I-Application
version	O
.	O
</s>
<s>
Since	O
version	O
6.0	O
,	O
which	O
was	O
released	O
on	O
September	O
18th	O
2007	O
,	O
the	O
BitTorrent	B-Protocol
client	B-Protocol
has	O
been	O
a	O
rebranded	O
version	O
of	O
μTorrent	B-Application
.	O
</s>
<s>
It	O
is	O
no	O
longer	O
open	B-Application
source	I-Application
.	O
</s>
<s>
The	O
BitTorrent	B-Protocol
client	B-Protocol
enables	O
a	O
user	O
to	O
search	O
for	O
and	O
download	B-Application
torrent	B-Protocol
files	O
using	O
a	O
built-in	O
search	O
box	O
(	O
"	O
Search	O
for	O
torrents	B-Protocol
"	O
)	O
in	O
the	O
main	O
window	O
,	O
which	O
opens	O
the	O
BitTorrent	B-Protocol
torrent	B-Protocol
search	I-Protocol
engine	O
page	O
with	O
the	O
search	B-Application
results	I-Application
in	O
the	O
user	O
's	O
default	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
The	O
current	O
client	B-Protocol
includes	O
a	O
range	O
of	O
features	O
,	O
including	O
multiple	O
parallel	O
downloads	B-Application
.	O
</s>
<s>
BitTorrent	B-Protocol
has	O
several	O
statistical	O
,	O
tabular	O
and	O
graphical	O
views	O
that	O
allow	O
a	O
user	O
to	O
see	O
what	O
events	O
are	O
happening	O
in	O
the	O
background	O
.	O
</s>
<s>
A	O
host	O
of	O
views	O
offer	O
information	O
on	O
the	O
peers	O
and	O
seeds	O
to	O
which	O
the	O
user	O
is	O
connected	O
,	O
including	O
how	O
much	O
data	O
is	O
being	O
downloaded	B-Application
from	O
each	O
and	O
to	O
how	O
much	O
data	O
is	O
being	O
uploaded	B-Application
by	O
each	O
.	O
</s>
<s>
The	O
client	B-Protocol
also	O
enables	O
users	O
to	O
create	O
and	O
share	O
torrent	B-Protocol
files	O
.	O
</s>
<s>
Versions	O
released	O
into	O
the	O
public	O
domain	O
or	O
under	O
MIT	B-License
License	I-License
Version	O
Release	O
date	O
Changes	O
2001	O
July	O
2Initial	O
release	O
2001	O
July	O
20Several	O
stability	O
and	O
performance	O
improvements	O
.	O
</s>
<s>
It	O
should	O
now	O
work	O
under	O
Windows	O
and	O
Mac	B-Application
OS	I-Application
X	O
.	O
</s>
<s>
2001	O
August	O
23A	O
fix	O
for	O
a	O
serious	O
problem	O
which	O
was	O
keeping	O
it	O
from	O
using	O
a	O
whole	O
net	O
connection	O
,	O
a	O
complete	O
rewrite	O
of	O
Downloader.py,	O
and	O
other	O
minor	O
tweaks	O
.	O
</s>
<s>
2001	O
September	O
12This	O
release	O
has	O
extensive	O
user	O
feedback	O
and	O
download	B-Application
resuming	O
.	O
</s>
<s>
The	O
publisher	O
now	O
stores	O
metadata	O
in	O
files	O
,	O
so	O
it	O
does	O
n't	O
have	O
to	O
re-scan	O
files	O
every	O
time	O
it	O
restarts	O
,	O
and	O
the	O
tracker	O
now	O
stores	O
publisher	O
and	O
downloader	B-Application
information	O
persistently	O
,	O
so	O
downloads	B-Application
start	O
working	O
again	O
as	O
soon	O
as	O
it	O
restarts	O
.	O
</s>
<s>
2002	O
January	O
6For	O
this	O
release	O
,	O
the	O
upload/download	O
logic	O
was	O
thoroughly	O
rewritten	O
to	O
use	O
a	O
tit-for-tat	O
bandwidth	O
trading	O
strategy	O
.	O
</s>
<s>
Usage	O
of	O
TCP	B-Protocol
buffering	O
was	O
also	O
greatly	O
improved	O
.	O
</s>
<s>
2002	O
March	O
18The	O
UI	O
is	O
much	O
nicer	O
,	O
and	O
now	O
looks	O
like	O
a	O
real	O
GUI	B-Application
.	O
</s>
<s>
2002	O
April	O
29Major	O
performance	O
enhancements	O
,	O
including	O
peers	O
reciprocating	O
uploads	B-Application
more	O
responsively	O
.	O
</s>
<s>
Much	O
better	O
error-handling	O
and	O
multi-file	O
support	O
were	O
added	O
,	O
so	O
multiple	O
files	O
can	O
be	O
downloaded	B-Application
with	O
a	O
single	O
click	O
.	O
</s>
<s>
2002	O
May	O
6In	O
this	O
release	O
,	O
the	O
tracker	O
has	O
been	O
rewritten	O
to	O
use	O
asynchronous	B-Architecture
I/O	I-Architecture
,	O
so	O
it	O
no	O
longer	O
has	O
the	O
hanging	O
problems	O
which	O
plagued	O
it	O
before	O
.	O
</s>
<s>
2002	O
June	O
5A	O
crippling	O
bug	O
in	O
the	O
download	B-Application
logic	O
has	O
been	O
fixed	O
.	O
</s>
<s>
It	O
should	O
scale	O
comfortably	O
to	O
thousands	O
of	O
simultaneous	O
downloaders	B-Application
now	O
.	O
</s>
<s>
Deployments	O
which	O
have	O
too	O
many	O
downloaders	B-Application
behind	O
NAT	O
can	O
now	O
keep	O
them	O
out	O
with	O
the	O
tracker	O
option	O
,	O
--nonat	O
1	O
.	O
</s>
<s>
2002	O
November	O
5A	O
polished	O
UI	O
,	O
improved	O
upload	B-Application
and	O
download	B-Application
rate	O
estimation	O
,	O
a	O
new	O
GUI	B-Application
for	O
making	O
metainfo	O
files	O
,	O
and	O
some	O
bugfixes	O
.	O
</s>
<s>
Upload	B-Application
rate	O
capping	O
was	O
added	O
.	O
</s>
<s>
2003	O
June	O
5This	O
version	O
is	O
enhanced	O
with	O
new	O
features	O
to	O
make	O
BitTorrent	B-Protocol
even	O
more	O
robust	O
and	O
easier	O
to	O
use	O
.	O
</s>
<s>
2003	O
September	O
24Files	O
now	O
only	O
get	O
allocated	O
as	O
they	O
're	O
downloaded	B-Application
,	O
and	O
do	O
n't	O
fragment	O
the	O
hard	O
drive	O
.	O
</s>
<s>
Large	O
torrents	B-Protocol
no	O
longer	O
hose	O
the	O
CPU	O
.	O
</s>
<s>
Better	O
network	O
utilization	O
and	O
more	O
consistent	O
download	B-Application
rates	O
have	O
been	O
achieved	O
.	O
</s>
<s>
Poorly	O
seeded	O
torrents	B-Protocol
now	O
get	O
out	O
faster	O
.	O
</s>
<s>
The	O
client	B-Protocol
no	O
longer	O
complains	O
about	O
tracker	O
connection	O
problems	O
when	O
transfers	O
are	O
still	O
going	O
.	O
</s>
<s>
2004	O
March	O
12The	O
tracker	O
works	O
under	O
Python	B-Language
2.2	O
and	O
supports	O
3.3	O
clients	O
properly	O
.	O
</s>
<s>
The	O
client	B-Protocol
is	O
unchanged	O
.	O
</s>
<s>
Versions	O
released	O
under	O
BitTorrent	B-License
Open	I-License
Source	I-License
License	I-License
Version	O
Release	O
date	O
Changes	O
2005	O
April	O
6This	O
release	O
introduces	O
an	O
all	O
new	O
queue-based	O
user	O
interface	O
(	O
based	O
on	O
GTK+	O
instead	O
of	O
wxWidgets	O
)	O
.	O
</s>
<s>
Many	O
options	O
are	O
now	O
modifiable	O
from	O
the	O
interface	O
,	O
including	O
upload	B-Application
rate	O
.	O
</s>
<s>
Statistics	O
are	O
now	O
visible	O
in	O
the	O
GUI	B-Application
.	O
</s>
<s>
BitTorrent	B-Protocol
packets	O
are	O
now	O
marked	O
as	O
bulk	O
data	O
to	O
make	O
traffic	O
shaping	O
easier	O
.	O
</s>
<s>
The	O
license	O
has	O
changed	O
to	O
the	O
"	O
BitTorrent	B-License
Open	I-License
Source	I-License
License	I-License
"	O
.	O
</s>
<s>
Torrents	B-Protocol
can	O
now	O
be	O
created	O
from	O
the	O
UI	O
.	O
</s>
<s>
GUI	B-Application
support	O
for	O
torrent	B-Protocol
comment	O
fields	O
has	O
been	O
added	O
.	O
</s>
<s>
2005	O
August	O
27Trackerless	O
Torrent	B-Protocol
files	O
can	O
now	O
be	O
identified	O
.	O
</s>
<s>
Opening	O
an	O
already	O
open	O
torrent	B-Protocol
now	O
behaves	O
correctly	O
.	O
</s>
<s>
Play/pause	O
state	O
is	O
no	O
longer	O
saved	O
across	O
invocations	O
of	O
the	O
GUI	B-Application
.	O
</s>
<s>
The	O
GUI	B-Application
and	O
layout	O
were	O
improved	O
.	O
</s>
<s>
Startup	O
time	O
on	O
trackerless	O
torrents	B-Protocol
was	O
greatly	O
improved	O
.	O
</s>
<s>
2005	O
November	O
3The	O
maximum	O
upload	B-Application
rate	O
slider	O
was	O
fixed	O
.	O
</s>
<s>
OS	O
X	O
client	B-Protocol
auto-update	O
was	O
added	O
.	O
</s>
<s>
Correct	O
BitTorrent	B-Protocol
icons	O
are	O
assured	O
for	O
all	O
windows	O
.	O
</s>
<s>
"	O
launchmany-curses	O
"	O
was	O
fixed	O
for	O
Python	B-Language
2.2	O
.	O
</s>
<s>
"	O
launchmany-curses	O
"	O
was	O
fixed	O
for	O
Python	B-Language
2.2	O
.	O
</s>
<s>
More	O
fixes	O
were	O
made	O
to	O
Python	B-Language
2.2	O
compatibility	O
issues	O
and	O
to	O
"	O
Invalid	O
Menu	O
Handle	O
"	O
cases	O
.	O
</s>
<s>
The	O
global	O
upload	B-Application
rate	O
calculation	O
was	O
fixed	O
.	O
</s>
<s>
2006	O
May	O
5This	O
release	O
features	O
a	O
completely	O
new	O
UI	O
,	O
the	O
introduction	O
of	O
smart	O
download/queuing	O
behavior	O
(	O
as	O
well	O
as	O
smart	O
seeding	O
behavior	O
)	O
,	O
a	O
torrent	B-Protocol
priority	O
system	O
,	O
encryption	O
support	O
,	O
download	B-Application
rate	O
control	O
,	O
fast	O
extensions	O
,	O
and	O
torrent	B-Protocol
"	O
title	O
"	O
support	O
.	O
</s>
<s>
Versions	O
released	O
under	O
a	O
Proprietary	B-Application
License	I-Application
Version	O
Release	O
date	O
Changes	O
2007	O
September	O
18BitTorrent	O
client	B-Protocol
is	O
now	O
a	O
rebranded	O
version	O
of	O
μTorrent	B-Application
.	O
</s>
<s>
BitTorrent	B-Protocol
DNA	O
(	O
BitTorrent	B-Protocol
Delivery	O
Network	O
Accelerator	O
)	O
program	O
added	O
.	O
</s>
<s>
License	O
has	O
changed	O
to	O
a	O
proprietary	B-Application
one	O
.	O
</s>
<s>
2019	O
October	O
16BitTorrent	O
client	B-Protocol
comes	O
in	O
two	O
versions	O
.	O
</s>
<s>
This	O
is	O
a	O
"	O
BitTorrent	B-Protocol
Classic	O
"	O
version	O
.	O
</s>
<s>
"	O
Web	O
"	O
Versions	O
released	O
under	O
a	O
Proprietary	B-Application
License	I-Application
Version	O
Release	O
date	O
Changes	O
2022	O
June	O
2BitTorrent	O
client	B-Protocol
comes	O
in	O
two	O
versions	O
.	O
</s>
<s>
This	O
is	O
a	O
"	O
BitTorrent	B-Protocol
Web	O
"	O
version	O
.	O
</s>
<s>
Fixed	O
crash	O
when	O
processing	O
autoadd	O
directory2012	O
July	O
25	O
2020	O
May	O
19BitTorrent	O
client	B-Protocol
comes	O
in	O
two	O
versions	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	O
"	O
Web	O
"	O
Version	O
HistoryVersionBuild	O
Features/Changes	O
BitTorrent	B-Protocol
client	B-Protocol
comes	O
in	O
two	O
versions	O
.	O
</s>
<s>
This	O
is	O
a	O
"	O
BitTorrent	B-Protocol
Web	O
"	O
version	O
.	O
</s>
<s>
BitTorrent	B-Protocol
DNA	O
(	O
BitTorrent	B-Protocol
Delivery	O
Network	O
Accelerator	O
)	O
is	O
a	O
program	O
designed	O
to	O
speed	O
up	O
the	O
viewing	O
of	O
streaming	B-Application
video	I-Application
,	O
downloading	B-Application
software	O
(	O
with	O
or	O
without	O
the	O
BitTorrent	B-Protocol
protocol	I-Protocol
)	O
and	O
playing	O
online	B-Application
video	I-Application
games	I-Application
.	O
</s>
<s>
It	O
does	O
so	O
by	O
distributing	O
the	O
end	O
users	O
 '	O
downloads	B-Application
between	O
each	O
other	O
.	O
</s>
<s>
BitTorrent	B-Protocol
DNA	O
is	O
different	O
from	O
traditional	O
BitTorrent	B-Protocol
in	O
that	O
it	O
relies	O
on	O
publisher	O
HTTP	B-Protocol
servers	O
in	O
order	O
to	O
provide	O
publishers	O
with	O
guaranteed	O
minimum	O
data	O
delivery	O
rate	O
,	O
as	O
well	O
as	O
give	O
publishers	O
control	O
over	O
content	O
delivery	O
(	O
peers	O
must	O
connect	O
to	O
the	O
origin	O
server	O
before	O
they	O
can	O
reach	O
other	O
peers	O
)	O
,	O
and	O
collect	O
information	O
about	O
content	O
delivery	O
to	O
share	O
with	O
the	O
publisher	O
.	O
</s>
<s>
It	O
also	O
can	O
give	O
bandwidth	O
to	O
TCP	B-Protocol
and	O
other	O
traffic	O
.	O
</s>
<s>
DNA	O
is	O
also	O
different	O
from	O
traditional	O
BitTorrent	B-Protocol
in	O
that	O
it	O
is	O
a	O
UDP-based	O
protocol	O
that	O
has	O
replaced	O
regular	O
TCP-based	O
bandwidth	O
throttling	O
with	O
a	O
much	O
more	O
sensitive	O
bandwidth	O
management	O
technique	O
.	O
</s>
<s>
Apart	O
from	O
being	O
installed	O
by	O
third	B-General_Concept
party	I-General_Concept
websites	O
and	O
software	O
companies	O
,	O
the	O
program	O
for	O
end	O
users	O
is	O
also	O
installed	O
when	O
the	O
official	O
BitTorrent	B-Protocol
client	B-Protocol
is	O
installed	O
(	O
starting	O
with	O
the	O
rebranded	O
version	O
6.0	O
)	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
the	O
DNA	O
made	O
it	O
possible	O
to	O
keep	O
the	O
DNA	O
application	O
installed	O
and	O
yet	O
temporarily	O
stopped	O
until	O
the	O
next	O
system	O
restart	O
(	O
through	O
the	O
system	O
's	O
control	O
panel	O
,	O
in	O
Windows	B-Application
XP	I-Application
)	O
.	O
</s>
<s>
The	O
DNA	O
GUI	B-Application
was	O
completely	O
removed	O
in	O
the	O
official	O
BitTorrent	B-Protocol
version	O
6.1	O
and	O
6.1.1	O
,	O
but	O
was	O
re-introduced	O
in	O
version	O
6.1.2	O
.	O
</s>
<s>
Since	O
October	O
,	O
2007	O
BitTorrent	B-Protocol
DNA	O
has	O
been	O
offered	O
by	O
BitTorrent	B-Protocol
,	O
Inc	O
.	O
as	O
a	O
commercial	O
service	O
that	O
content	O
providers	O
can	O
purchase	O
(	O
for	O
an	O
undisclosed	O
price	O
)	O
and	O
as	O
a	O
free	O
background	O
program	O
for	O
end	O
users	O
.	O
</s>
<s>
Company	O
President	O
Ashwin	O
Navin	O
launched	O
the	O
product	O
claiming	O
that	O
"	O
Implementing	O
BitTorrent	B-Protocol
DNA	O
on	O
top	O
of	O
legacy	O
infrastructure	O
has	O
the	O
profound	O
impact	O
of	O
allowing	O
our	O
customers	O
to	O
deliver	O
a	O
better	O
user	O
experience	O
,	O
higher	O
quality	O
video	O
,	O
faster	O
software	O
downloads	B-Application
,	O
all	O
with	O
the	O
security	O
and	O
reliability	O
of	O
a	O
managed	O
service.	O
"	O
</s>
<s>
Navin	O
in	O
a	O
podcast	B-Operating_System
interview	O
claimed	O
that	O
he	O
attempted	O
to	O
sell	O
BitTorrent	B-Protocol
DNA	O
in	O
January	O
2005	O
.	O
</s>
<s>
After	O
finding	O
that	O
BitTorrent	B-Protocol
's	O
brand	O
was	O
too	O
polarizing	O
for	O
potential	O
customers	O
,	O
they	O
delayed	O
the	O
launch	O
until	O
after	O
partnering	O
with	O
nearly	O
50	O
media	O
companies	O
in	O
the	O
.	O
</s>
<s>
That	O
provided	O
the	O
company	O
enough	O
public	O
validation	O
to	O
finally	O
launch	O
BitTorrent	B-Protocol
DNA	O
two	O
and	O
half	O
years	O
later	O
.	O
</s>
<s>
The	O
service	O
's	O
first	O
customer	O
was	O
the	O
company	O
Brightcove	O
,	O
that	O
chose	O
to	O
use	O
it	O
to	O
distribute	O
streaming	B-Application
video	I-Application
files	O
.	O
</s>
<s>
As	O
of	O
May	O
2009	O
,	O
the	O
Asus	O
support	O
website	O
is	O
using	O
BitTorrent	B-Protocol
DNA	O
as	O
an	O
additional	O
download	B-Application
method	O
of	O
their	O
larger	O
files	O
in	O
addition	O
to	O
their	O
multiple	O
somewhat	O
internationally	O
distributed	O
HTTP	B-Protocol
servers	O
and	O
content	O
delivery	O
mirrors	O
and	O
other	O
redirection	O
facilities	O
Asus	O
has	O
been	O
known	O
to	O
rely	O
in	O
the	O
present	O
and	O
past	O
for	O
their	O
data	O
delivery	O
needs	O
.	O
</s>
<s>
Currently	O
,	O
a	O
separate	O
"	O
P2P	O
"	O
icon	O
is	O
being	O
presented	O
for	O
the	O
DNA	O
style	O
downloads	B-Application
next	O
to	O
the	O
"	O
Global	O
"	O
and	O
"	O
Chinese	O
"	O
located	O
servers	O
as	O
an	O
example	O
.	O
</s>
