<s>
Okular	B-Language
is	O
a	O
multiplatform	O
document	O
viewer	O
developed	O
by	O
the	O
KDE	B-Application
community	I-Application
and	O
based	O
on	O
Qt	B-Language
and	O
KDE	B-Language
Frameworks	I-Language
libraries	O
.	O
</s>
<s>
It	O
is	O
distributed	O
as	O
part	O
of	O
the	O
KDE	B-Language
Applications	I-Language
bundle	O
.	O
</s>
<s>
Its	O
origins	O
are	O
from	O
KPDF	O
and	O
it	O
replaces	O
KPDF	O
,	O
KGhostView	O
,	O
KFax	O
,	O
KFaxview	O
and	O
KDVI	O
in	O
KDE	B-Application
4	O
.	O
</s>
<s>
Okular	B-Language
was	O
started	O
for	O
the	O
Google	B-Application
Summer	I-Application
of	I-Application
Code	I-Application
of	O
2005	O
by	O
Piotr	O
Szymański	O
.	O
</s>
<s>
Okular	B-Language
was	O
identified	O
as	O
a	O
success	O
story	O
of	O
the	O
2007	O
Season	B-Application
of	I-Application
Usability	I-Application
.	O
</s>
<s>
In	O
this	O
season	O
the	O
Okular	B-Language
toolbar	O
mockup	O
was	O
created	O
based	O
on	O
an	O
analysis	O
of	O
other	O
popular	O
document	O
viewers	O
and	O
a	O
usage	O
survey	O
.	O
</s>
<s>
When	O
it	O
was	O
ported	O
to	O
Qt	B-Language
5	O
in	O
December	O
2016	O
,	O
the	O
version	O
numbering	O
jumped	O
from	O
0.26	O
to	O
1.0	O
.	O
</s>
<s>
Since	O
September	O
2019	O
,	O
Okular	B-Language
is	O
available	O
in	O
the	O
Windows	O
Store	O
.	O
</s>
<s>
In	O
February	O
2022	O
,	O
Okular	B-Language
was	O
awarded	O
the	O
Blue	O
Angel	O
environmental	O
label	O
award	O
by	O
the	O
German	O
government	O
for	O
sustainable	O
software	O
design	O
.	O
</s>
<s>
Okular	B-Language
's	O
annotation	O
features	O
include	O
commenting	O
on	O
PDF	B-Application
documents	I-Application
,	O
highlighting	O
and	O
drawing	O
lines	O
,	O
geometric	O
shapes	O
,	O
adding	O
textboxes	O
,	O
and	O
stamps	O
.	O
</s>
<s>
Annotations	O
are	O
stored	O
separately	O
from	O
the	O
unmodified	O
PDF	B-Application
file	I-Application
,	O
or	O
(	O
since	O
version	O
0.15	O
with	O
Poppler	B-Language
0.20	O
)	O
can	O
be	O
saved	O
in	O
the	O
document	O
as	O
standard	O
PDF	B-Application
annotations	O
.	O
</s>
<s>
Other	O
features	O
include	O
reading	B-Application
text	I-Application
aloud	I-Application
using	O
the	O
Qt	B-Language
Speech	O
module	O
part	O
of	O
Qt	B-Language
since	O
Qt	B-Language
5	O
(	O
previously	O
using	O
the	O
Jovie	O
,	O
)	O
,	O
trimming	O
of	O
white	O
page	O
borders	O
and	O
setting	O
of	O
bookmarks	O
.	O
</s>
<s>
The	O
official	O
version	O
obeys	O
the	O
DRM	O
restrictions	O
of	O
PDF	B-Application
files	I-Application
by	O
default	O
,	O
which	O
may	O
prevent	O
copying	O
,	O
printing	O
,	O
or	O
converting	O
some	O
PDF	B-Application
files	I-Application
.	O
</s>
