<s>
OllyDbg	B-Application
(	O
named	O
after	O
its	O
author	O
,	O
Oleh	O
Yuschuk	O
)	O
was	O
an	O
x86	B-Operating_System
debugger	B-Application
that	O
emphasizes	O
binary	O
code	O
analysis	O
,	O
which	O
is	O
useful	O
when	O
source	O
code	O
is	O
not	O
available	O
.	O
</s>
<s>
It	O
traces	O
registers	O
,	O
recognizes	O
procedures	O
,	O
API	B-Application
calls	O
,	O
switches	O
,	O
tables	O
,	O
constants	O
and	O
strings	O
,	O
as	O
well	O
as	O
locates	O
routines	O
from	O
object	O
files	O
and	O
libraries	O
.	O
</s>
<s>
Version	O
2.0	O
was	O
released	O
in	O
June	O
2010	O
,	O
and	O
OllyDbg	B-Application
has	O
been	O
rewritten	O
from	O
the	O
ground	O
up	O
in	O
this	O
release	O
.	O
</s>
<s>
Although	O
the	O
current	O
version	O
of	O
OllyDbg	B-Application
cannot	O
disassemble	O
binaries	O
compiled	O
for	O
64-bit	O
processors	O
,	O
a	O
64-bit	O
version	O
of	O
the	O
debugger	B-Application
has	O
been	O
promised	O
.	O
</s>
<s>
The	O
software	O
is	O
free	O
of	O
cost	O
,	O
but	O
the	O
shareware	B-License
license	O
of	O
version	O
1.x	O
requires	O
users	O
to	O
register	B-General_Concept
with	O
the	O
author	O
.	O
</s>
<s>
The	O
disassembler	O
part	O
of	O
OllyDbg	B-Application
is	O
free	O
software	O
,	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
OllyDbg	B-Application
is	O
often	O
used	O
for	O
reverse	O
engineering	O
of	O
programs	O
.	O
</s>
<s>
It	O
is	O
often	O
used	O
by	O
crackers	B-Application
to	O
crack	B-Application
software	O
made	O
by	O
other	O
developers	O
.	O
</s>
<s>
For	O
cracking	O
and	O
reverse	O
engineering	O
,	O
it	O
is	O
often	O
the	O
primary	O
tool	O
because	O
of	O
its	O
ease	O
of	O
use	O
and	O
availability	O
;	O
any	O
32-bit	O
executable	O
can	O
be	O
used	O
by	O
the	O
debugger	B-Application
and	O
edited	O
in	O
bitcode/assembly	O
in	O
realtime	O
.	O
</s>
