<s>
Ink	B-Device
Serialized	I-Device
Format	I-Device
(	O
ISF	O
)	O
is	O
a	O
Microsoft	O
format	O
to	O
store	O
written	O
ink	O
information	O
.	O
</s>
<s>
The	O
format	O
is	O
mainly	O
used	O
for	O
mobile	O
devices	O
like	O
Personal	B-Application
digital	I-Application
assistants	I-Application
,	O
tablet	B-Device
PCs	I-Device
and	O
Ultra-Mobile	B-Device
PCs	I-Device
to	O
store	O
data	O
entered	O
with	O
a	O
stylus	B-Device
.	O
</s>
<s>
This	O
allows	O
for	O
ISF	O
format	O
to	O
be	O
used	O
even	O
together	O
with	O
open	B-Application
source	I-Application
software	I-Application
licensing	O
like	O
GPL2	O
.	O
</s>
