<s>
PDFtk	B-Language
(	O
short	O
for	O
PDF	B-Application
Toolkit	B-Library
)	O
is	O
a	O
toolkit	B-Library
for	O
manipulating	O
Portable	B-Application
Document	I-Application
Format	I-Application
(	O
PDF	B-Application
)	O
documents	O
.	O
</s>
<s>
It	O
runs	O
on	O
Linux	B-Application
,	O
Windows	B-Application
and	O
MacOS	B-Application
.	O
</s>
<s>
It	O
comes	O
in	O
three	O
versions	O
:	O
PDFtk	B-Language
Server	O
(	O
open-source	B-License
command-line	B-Application
tool	I-Application
)	O
,	O
PDFtk	B-Language
Free	O
(	O
freeware	B-License
)	O
and	O
PDFtk	B-Language
Pro	O
(	O
proprietary	B-Application
paid	I-Application
)	O
.	O
</s>
<s>
It	O
is	O
able	O
to	O
concatenate	O
,	O
shuffle	O
,	O
split	O
and	O
rotate	O
PDF	B-Application
files	I-Application
.	O
</s>
<s>
Both	O
CLI	B-Application
and	O
GUI	B-Application
versions	O
of	O
PDFTK	B-Language
are	O
available	O
.	O
</s>
<s>
pdftk-java	O
is	O
a	O
port	O
of	O
PDFtk	B-Language
into	O
Java	B-Language
which	O
is	O
developed	O
by	O
Marc	O
Vinyals	O
and	O
GPL	B-License
licensed	O
.	O
</s>
