<s>
LeechModem	B-Protocol
was	O
a	O
BBS	B-Application
file	B-Protocol
transfer	I-Protocol
protocol	I-Protocol
client	O
.	O
</s>
<s>
LeechModem	B-Protocol
was	O
compatible	O
with	O
protocols	O
like	O
XMODEM	B-Protocol
(	O
and	O
YMODEM	B-Protocol
)	O
,	O
but	O
it	O
would	O
mischievously	O
NAK	B-Protocol
the	O
last	O
packet	O
and	O
then	O
abort	O
the	O
file	O
transfer	O
.	O
</s>
<s>
The	O
user	O
had	O
successfully	O
downloaded	O
the	O
file	O
,	O
but	O
the	O
BBS	B-Application
would	O
mistakenly	O
not	O
count	O
the	O
aborted	O
file	O
transfer	O
against	O
the	O
user	O
's	O
download	O
quota	O
.	O
</s>
<s>
Leech	O
ZMODEM	B-Device
was	O
suggested	O
by	O
Sam	O
Brown	O
but	O
written	O
by	O
a	O
long	O
lost	O
friend	O
in	O
Atlanta	O
,	O
GA	O
.	O
Leech	O
ZMODEM	B-Device
was	O
a	O
LeechModem	B-Protocol
variant	O
that	O
was	O
compatible	O
with	O
the	O
faster	O
ZMODEM	B-Device
streaming	O
file-transfer	O
protocol	O
.	O
</s>
<s>
Subsequent	O
versions	O
of	O
Leech	O
ZMODEM	B-Device
were	O
authored	O
by	O
Sam	O
Brown	O
.	O
</s>
<s>
LeechModem	B-Protocol
was	O
used	O
successfully	O
for	O
2-3	O
years	O
by	O
a	O
small	O
group	O
of	O
people	O
centered	O
in	O
the	O
408	O
area	O
code	O
and	O
203	O
area	O
code	O
.	O
</s>
<s>
It	O
was	O
not	O
until	O
the	O
LeechModem	B-Protocol
software	O
was	O
leaked	O
that	O
it	O
was	O
discovered	O
and	O
counter-measures	O
were	O
built	O
into	O
BBS	B-Application
software	O
.	O
</s>
<s>
Emulex/2	B-Application
was	O
the	O
first	O
BBS	B-Application
software	O
to	O
support	O
Anti-LeechModem	O
technology	O
.	O
</s>
<s>
This	O
was	O
because	O
Sam	O
Brown	O
wrote	O
Emulex/2	B-Application
BBS	B-Application
software	O
as	O
well	O
.	O
</s>
<s>
A	O
common	O
method	O
was	O
rounding	O
the	O
file	O
size	O
to	O
the	O
nearest	O
kilobyte	O
,	O
causing	O
the	O
user	O
to	O
be	O
unaware	O
of	O
the	O
exact	O
file	O
size	O
,	O
rendering	O
Leechmodem	B-Protocol
unusable	O
.	O
</s>
