<s>
Sentry	B-Application
2020	I-Application
is	O
a	O
commercial	O
software	O
program	O
for	O
"	O
transparent	O
"	O
disk	O
encryption	O
for	O
PC	O
and	O
PDA	O
.	O
</s>
<s>
It	O
has	O
two	O
compatible	O
versions	O
,	O
one	O
for	O
desktop	O
Windows	B-Application
XP	I-Application
and	O
one	O
for	O
Windows	B-Operating_System
Mobile	I-Operating_System
6.5.3	O
,	O
which	O
allows	O
using	O
the	O
same	O
encrypted	O
volume	O
on	O
both	O
platforms	O
.	O
</s>
