<s>
chntpw	B-Application
is	O
a	O
software	O
utility	O
for	O
resetting	O
or	O
blanking	O
local	O
passwords	O
used	O
by	O
Windows	B-Device
NT	I-Device
,	O
2000	B-Application
,	O
XP	B-Application
,	O
Vista	B-Application
,	O
7	B-Device
,	O
8	B-Application
,	O
8.1	B-Device
and	O
10	B-Operating_System
.	O
</s>
<s>
It	O
does	O
this	O
by	O
editing	O
the	O
SAM	O
database	O
where	O
Windows	O
stores	O
password	O
hashes	B-Algorithm
.	O
</s>
<s>
There	O
are	O
two	O
ways	O
to	O
use	O
the	O
program	O
:	O
via	O
the	O
standalone	O
chntpw	B-Application
utility	O
installed	O
as	O
a	O
package	O
available	O
in	O
most	O
modern	O
Linux	B-Application
distributions	I-Application
(	O
e.g.	O
</s>
<s>
Ubuntu	B-Operating_System
)	O
or	O
via	O
a	O
bootable	O
CD/USB	O
image	O
.	O
</s>
<s>
chntpw	B-Application
has	O
no	O
support	O
for	O
fully	O
encrypted	O
NTFS	O
partitions	O
(	O
the	O
only	O
possible	O
exceptions	O
to	O
this	O
are	O
encrypted	O
partitions	O
readable	O
by	O
Linux	B-Application
such	O
as	O
e.g.	O
</s>
<s>
LUKS	O
)	O
,	O
usernames	O
containing	O
Unicode	O
characters	O
,	O
or	O
Active	B-Protocol
Directory	I-Protocol
passwords	O
(	O
with	O
the	O
exception	O
of	O
local	O
users	O
of	O
systems	O
that	O
are	O
members	O
of	O
an	O
AD	O
domain	O
)	O
.	O
</s>
<s>
In	O
such	O
cases	O
use	O
of	O
the	O
stand-alone	O
program	O
in	O
a	O
full-featured	O
Linux	B-Application
environment	O
is	O
recommended	O
.	O
</s>
<s>
The	O
chntpw	B-Application
utility	O
is	O
included	O
in	O
many	O
various	O
Linux	B-Application
distributions	I-Application
,	O
including	O
ones	O
focused	O
on	O
security	O
:	O
</s>
<s>
For	O
the	O
software	O
's	O
10th	O
anniversary	O
,	O
the	O
author	O
changed	O
the	O
license	B-License
from	O
a	O
non-commercial	O
one	O
to	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
Version	O
2	O
.	O
</s>
