<s>
The	O
zlib	B-License
license	I-License
is	O
a	O
permissive	B-License
free	I-License
software	I-License
license	I-License
which	O
defines	O
the	O
terms	O
under	O
which	O
the	O
zlib	B-Language
software	B-Library
library	I-Library
can	O
be	O
distributed	O
.	O
</s>
<s>
It	O
is	O
also	O
used	O
by	O
many	O
other	O
free	B-Application
software	I-Application
packages	O
.	O
</s>
<s>
The	O
libpng	B-Language
library	O
uses	O
a	O
similar	O
license	O
sometimes	O
referred	O
interchangeably	O
as	O
zlib/libpng	B-License
license	I-License
.	O
</s>
<s>
The	O
zlib	B-License
license	I-License
has	O
been	O
approved	O
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
(	O
FSF	O
)	O
as	O
a	O
free	B-License
software	I-License
license	I-License
,	O
and	O
by	O
the	O
Open	O
Source	O
Initiative	O
(	O
OSI	O
)	O
as	O
an	O
open	O
source	O
license	O
.	O
</s>
<s>
It	O
is	O
compatible	O
with	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
