<s>
BitComet	B-Protocol
(	O
originally	O
named	O
SimpleBT	B-Protocol
client	B-Protocol
from	O
versions	O
0.11	O
to	O
0.37	O
)	O
is	O
a	O
cross-protocol	O
BitTorrent	B-Protocol
,	O
HTTP	B-Protocol
and	O
FTP	B-Protocol
client	B-Protocol
written	O
in	O
C++	B-Language
for	O
Microsoft	B-Application
Windows	I-Application
and	O
available	O
in	O
52	O
different	O
languages	O
.	O
</s>
<s>
The	O
current	O
BitComet	B-Protocol
logo	O
has	O
been	O
used	O
since	O
version	O
0.50	O
.	O
</s>
<s>
The	O
BitComet	B-Protocol
program	O
is	O
a	O
multi-threaded	O
multi-protocol	O
hybrid	O
download	B-Protocol
manager	I-Protocol
and	O
BitTorrent	B-Protocol
peer-to-peer	O
(	O
P2P	O
)	O
file-sharing	O
application	O
.	O
</s>
<s>
To	O
complete	O
a	O
particular	O
download	O
,	O
it	O
can	O
draw	O
parts	O
of	O
files	O
from	O
many	O
sources	O
across	O
different	O
P2P	O
and	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
protocols	O
.	O
</s>
<s>
BitComet	B-Protocol
's	O
main	O
features	O
include	O
an	O
embedded	O
Internet	B-Application
Explorer	I-Application
window	O
to	O
let	O
users	O
search	O
for	O
torrents	B-Protocol
.	O
</s>
<s>
Along	O
with	O
the	O
features	O
typical	O
of	O
contemporary	O
BitTorrent	B-Protocol
clients	O
,	O
it	O
supports	O
UPnP	B-Application
gateway	O
configuration	O
,	O
bandwidth	O
scheduling	O
,	O
Webseeding	O
,	O
selecting	O
only	O
certain	O
files	O
for	O
download	O
inside	O
a	O
torrent	B-Protocol
package	O
,	O
NAT	B-Protocol
traversal	I-Protocol
(	O
removed	O
in	O
v.1.03	O
)	O
,	O
Peer	O
Exchange	O
(	O
in	O
older	O
versions	O
,	O
using	O
a	O
proprietary	O
protocol	O
and	O
starting	O
with	O
v.1.19	O
also	O
by	O
using	O
the	O
Extension	O
Protocol	O
,	O
implementing	O
a	O
PEX	O
mechanism	O
compatible	O
with	O
μTorrent	O
/	O
Mainline	O
PEX	O
)	O
,	O
Initial-Seeding	O
(	O
Super-Seeding	O
)	O
and	O
support	O
for	O
Magnet	B-Protocol
Links	I-Protocol
.	O
</s>
<s>
When	O
downloading	O
,	O
BitComet	B-Protocol
provides	O
the	O
option	O
to	O
prioritize	O
the	O
first	O
and	O
last	O
portions	O
of	O
media	O
files	O
so	O
that	O
files	O
may	O
be	O
previewed	O
before	O
they	O
are	O
completely	O
downloaded.It	O
also	O
has	O
a	O
"	O
Preview	O
Download	O
Mode	O
"	O
in	O
which	O
all	O
pieces	O
of	O
the	O
torrent	B-Protocol
will	O
be	O
,	O
basically	O
,	O
downloaded	O
sequentially	O
thus	O
allowing	O
the	O
user	O
to	O
play	O
a	O
media	O
file	O
while	O
downloading	O
(	O
provided	O
that	O
the	O
downloading	O
speed	O
and	O
piece	O
availability	O
stay	O
ahead	O
of	O
playing	O
bitrate	O
)	O
.BitComet	O
also	O
allows	O
users	O
to	O
share	O
their	O
.torrent	O
files	O
,	O
on	O
a	O
searchable	O
P2P	O
network	O
,	O
with	O
other	O
BitComet	B-Protocol
users	O
through	O
the	O
torrent	B-Protocol
sharing	O
feature	O
,	O
named	O
"	O
Torrent	B-Protocol
Share	O
"	O
in	O
previous	O
versions	O
and	O
renamed	O
to	O
"	O
Torrent	B-Protocol
Exchange	O
"	O
since	O
v.1.17	O
.	O
</s>
<s>
BitComet	B-Protocol
uses	O
the	O
Kademlia	B-Operating_System
(	O
mainline	O
)	O
DHT	B-Operating_System
to	O
operate	O
even	O
when	O
the	O
tracker	B-Protocol
is	O
offline	O
.	O
</s>
<s>
BitComet	B-Protocol
is	O
capable	O
of	O
downloading	O
files	O
over	O
HTTP	B-Protocol
and	O
FTP	B-Protocol
as	O
well	O
as	O
bittorrent	B-Protocol
,	O
and	O
it	O
includes	O
download	O
plugins	O
for	O
Firefox	B-Application
,	O
Internet	B-Application
Explorer	I-Application
,	O
and	O
Maxthon	B-Application
.	O
</s>
<s>
The	O
plugin	O
is	O
a	O
modified	O
version	O
of	O
the	O
GPL	B-License
eMule	B-Protocol
program	O
.	O
</s>
<s>
The	O
software	O
includes	O
an	O
application	O
to	O
play	O
Flash	B-Operating_System
Video	I-Operating_System
files	O
(	O
.flv	B-Operating_System
and	O
.swf	O
files	O
)	O
.	O
</s>
<s>
In	O
February	O
2011	O
,	O
BitComet	B-Protocol
launched	O
an	O
anonymous	O
downloading	O
feature	O
to	O
its	O
VIP	O
customers	O
.	O
</s>
<s>
Using	O
this	O
feature	O
,	O
downloads	O
will	O
be	O
handled	O
by	O
BitComet	B-Protocol
VIP	O
servers	O
and	O
the	O
real	O
IP	O
address	O
of	O
the	O
user	O
will	O
be	O
hidden	O
.	O
</s>
<s>
BitComet.com	O
offers	O
a	O
BitTorrent	B-Protocol
tracker	I-Protocol
available	O
for	O
download	O
from	O
the	O
official	O
site	O
.	O
</s>
<s>
The	O
FLV	B-Operating_System
player	O
program	O
can	O
also	O
be	O
downloaded	O
separately	O
and	O
used	O
independently	O
of	O
the	O
BitComet	B-Protocol
software	O
.	O
</s>
<s>
Since	O
version	O
0.86	O
BitComet	B-Protocol
includes	O
discussion	O
and	O
stat-tracking	O
features	O
which	O
send	O
information	O
about	O
torrents	B-Protocol
to	O
the	O
Bitcomet.com	O
servers	O
,	O
including	O
the	O
torrent	B-Protocol
hash	B-Error_Name
.	O
</s>
<s>
During	O
version	O
0.60	O
,	O
BitComet	B-Protocol
received	O
bad	O
publicity	O
because	O
its	O
implementation	O
of	O
the	O
DHT	B-Operating_System
feature	O
,	O
which	O
was	O
new	O
at	O
the	O
time	O
,	O
could	O
be	O
exploited	O
to	O
ignore	O
the	O
private	O
flag	O
of	O
a	O
tracker	B-Protocol
.	O
</s>
<s>
This	O
allowed	O
users	O
to	O
avoid	O
download	O
and	O
upload	O
ratio	O
restrictions	O
,	O
which	O
are	O
common	O
on	O
private	O
trackers	B-Protocol
.	O
</s>
<s>
Some	O
private	O
trackers	B-Protocol
responded	O
to	O
this	O
by	O
blacklisting	O
version	O
0.60	O
.	O
</s>
<s>
BitComet	B-Protocol
developer	O
RnySmile	O
reverted	O
the	O
client	B-Protocol
back	O
to	O
version	O
0.59	O
in	O
response	O
to	O
the	O
blacklisting	O
.	O
</s>
<s>
The	O
DHT	B-Operating_System
exploit	O
was	O
fixed	O
in	O
version	O
0.61	O
.	O
</s>
<s>
Starting	O
with	O
version	O
0.85	O
(	O
from	O
early	O
2007	O
)	O
,	O
BitComet	B-Protocol
added	O
a	O
non-standard	O
option	O
to	O
its	O
torrent	B-Protocol
maker	O
that	O
ensures	O
that	O
no	O
two	O
data	O
files	O
in	O
a	O
multi-file	O
torrent	B-Protocol
occupy	O
the	O
same	O
BitTorrent	B-Protocol
"	O
piece.	O
"	O
</s>
<s>
To	O
accomplish	O
this	O
,	O
BitComet	B-Protocol
includes	O
in	O
the	O
torrent	B-Protocol
a	O
collection	O
of	O
empty	O
"	O
padding	O
"	O
files	O
which	O
houses	O
the	O
remainder	O
of	O
each	O
file	O
's	O
last	O
"	O
piece	O
"	O
.	O
</s>
<s>
While	O
these	O
files	O
are	O
transparent	O
to	O
BitComet	B-Protocol
users	O
,	O
they	O
damage	O
the	O
performance	O
of	O
other	O
clients	O
,	O
because	O
peers	O
must	O
devote	O
resources	O
and	O
bandwidth	O
to	O
the	O
padding	O
files	O
,	O
with	O
no	O
benefit	O
to	O
the	O
non-BitComet	O
users	O
.	O
</s>
<s>
BitComet	B-Protocol
developers	O
added	O
this	O
feature	O
to	O
allow	O
support	O
of	O
a	O
feature	O
called	O
Long-Term	O
Seeding	O
in	O
which	O
the	O
BitComet	B-Protocol
client	B-Protocol
can	O
download	O
files	O
from	O
other	O
BitComet	B-Protocol
clients	O
who	O
have	O
an	O
identical	O
file	O
but	O
not	O
from	O
the	O
same	O
torrent	B-Protocol
.	O
</s>
<s>
It	O
also	O
allows	O
the	O
downloading	O
of	O
individual	O
files	O
from	O
other	O
non	O
torrent	B-Protocol
sources	O
like	O
ED2K	O
links	O
.	O
</s>
<s>
The	O
download	O
site	O
FileHippo	B-Application
ceased	O
carrying	O
new	O
versions	O
of	O
BitComet	B-Protocol
in	O
April	O
2008	O
,	O
with	O
this	O
announcement	O
.	O
</s>
<s>
As	O
of	O
April	O
2008	O
FileHippo	B-Application
will	O
no	O
longer	O
be	O
updating	O
BitComet	B-Protocol
.	O
</s>
<s>
As	O
they	O
have	O
copied	O
the	O
FileHippo	B-Application
site	O
text	O
,	O
files	O
,	O
images	O
and	O
update	O
checker	O
and	O
are	O
passing	O
it	O
off	O
as	O
original	O
work	O
.	O
</s>
<s>
We	O
recommend	O
you	O
use	O
a	O
different	O
more	O
reputable	O
torrent	B-Protocol
client	B-Protocol
such	O
as	O
uTorrent	O
.	O
</s>
<s>
This	O
occurred	O
after	O
FileHippo	B-Application
reportedly	O
noticed	O
that	O
the	O
design	O
and	O
code	O
of	O
the	O
AppHit.com	O
site	O
was	O
very	O
similar	O
with	O
the	O
one	O
FileHippo	B-Application
used	O
,	O
copying	O
not	O
only	O
icons	O
,	O
but	O
text	O
from	O
FileHippo	B-Application
's	O
website	O
and	O
FileHippo	B-Application
's	O
own	O
original	O
update	O
checking	O
software	O
.	O
</s>
<s>
Because	O
AppHit	O
and	O
BitComet	B-Protocol
were	O
contractual	O
partners	O
,	O
FileHippo	B-Application
decided	O
to	O
stop	O
carrying	O
BitComet	B-Protocol
.	O
</s>
<s>
BitComet	B-Protocol
has	O
since	O
terminated	O
the	O
partnership	O
,	O
by	O
2015	O
FileHippo	B-Application
made	O
BitComet	B-Protocol
available	O
once	O
more	O
.	O
</s>
<s>
According	O
to	O
the	O
official	O
BitTorrent	B-Protocol
specification	O
,	O
'	O
All	O
strings	O
in	O
a	O
.torrent	O
file	O
that	O
contains	O
text	O
must	O
be	O
UTF-8	O
encoded	O
 '	O
.	O
</s>
<s>
When	O
generating	O
torrents	B-Protocol
on	O
non-Latin	O
character	O
systems	O
such	O
as	O
Chinese	O
or	O
Japanese	O
,	O
BitComet	B-Protocol
versions	O
prior	O
to	O
1.20	O
encoded	O
the	O
files	O
 '	O
names	O
and	O
paths	O
using	O
the	O
Windows	O
Chinese/Japanese	O
code	O
page	O
,	O
and	O
stored	O
a	O
UTF-8	O
version	O
in	O
a	O
non-standard	O
attribute	O
.	O
</s>
<s>
Starting	O
with	O
the	O
March	O
2010	O
release	O
of	O
version	O
1.20	O
,	O
BitComet	B-Protocol
's	O
torrent	B-Protocol
format	O
now	O
conforms	O
to	O
the	O
standard	O
.	O
</s>
