<s>
PDFedit	B-Language
is	O
a	O
free	B-Application
PDF	B-Language
editor	I-Language
for	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
(	O
including	O
Cygwin	B-Language
on	O
top	O
of	O
Windows	B-Application
)	O
.	O
</s>
<s>
It	O
does	O
not	O
support	O
editing	O
protected	O
or	O
encrypted	O
PDF	B-Application
files	I-Application
or	O
word	O
processor-style	O
text	O
manipulation	O
,	O
however	O
.	O
</s>
<s>
PDFedit	B-Language
GUI	O
is	O
based	O
on	O
the	O
Qt	B-Language
3	I-Language
toolkit	I-Language
and	O
scripting	O
engine	O
(	O
QSA	O
)	O
,	O
so	O
every	O
operation	O
is	O
scriptable	O
.	O
</s>
<s>
It	O
also	O
has	O
the	O
ability	O
to	O
be	O
scripted	O
in	O
ECMAScript	B-Language
.	O
</s>
<s>
Part	O
of	O
the	O
program	O
is	O
also	O
command	B-Application
line	I-Application
interface	I-Application
for	O
PDF	B-Application
manipulation	O
.	O
</s>
<s>
Xpdf	B-Protocol
is	O
used	O
for	O
low	O
level	O
processing	O
.	O
</s>
<s>
PDF	B-Application
is	O
a	O
complex	O
format	O
designed	O
for	O
publishing	O
output	O
,	O
not	O
for	O
any	O
further	O
modifications	O
.	O
</s>
<s>
PDFedit	B-Language
is	O
a	O
low-level	O
tool	O
for	O
technical	O
users	O
that	O
provides	O
structured	O
access	O
to	O
the	O
internal	O
structure	O
of	O
the	O
PDF	B-Application
file	I-Application
.	O
</s>
<s>
It	O
may	O
require	O
familiarity	O
with	O
PDF	B-Application
specifications	O
to	O
be	O
able	O
to	O
make	O
substantial	O
modifications	O
.	O
</s>
