<s>
The	O
Apple	B-License
Public	I-License
Source	I-License
License	I-License
(	O
APSL	O
)	O
is	O
the	O
open-source	O
and	O
free	B-License
software	I-License
license	I-License
under	O
which	O
Apple	O
's	O
Darwin	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
was	O
released	O
in	O
2000	O
.	O
</s>
<s>
A	O
free	O
and	O
open-source	O
software	O
license	O
was	O
voluntarily	O
adopted	O
to	O
further	O
involve	O
the	O
community	O
from	O
which	O
much	O
of	O
Darwin	B-Operating_System
originated	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
the	O
Apple	B-License
Public	I-License
Source	I-License
License	I-License
was	O
approved	O
by	O
the	O
Open	O
Source	O
Initiative	O
(	O
OSI	O
)	O
.	O
</s>
<s>
Version	O
2.0	O
,	O
released	O
July	O
29	O
,	O
2003	O
,	O
is	O
also	O
approved	O
as	O
a	O
free	B-License
software	I-License
license	I-License
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
(	O
FSF	O
)	O
which	O
finds	O
it	O
acceptable	O
for	O
developers	O
to	O
work	O
on	O
projects	O
that	O
are	O
already	O
covered	O
by	O
this	O
license	O
.	O
</s>
<s>
However	O
,	O
the	O
FSF	O
recommends	O
that	O
developers	O
should	O
not	O
release	O
new	O
projects	O
under	O
this	O
license	O
,	O
because	O
the	O
partial	B-License
copyleft	I-License
is	O
not	O
compatible	O
with	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
and	O
allows	O
linking	O
with	O
files	O
released	O
entirely	O
as	O
proprietary	B-Application
software	I-Application
.	O
</s>
<s>
The	O
license	O
does	O
require	O
that	O
if	O
any	O
derivatives	O
of	O
the	O
original	O
source	O
are	O
released	O
externally	O
,	O
their	O
source	O
should	O
be	O
made	O
available	O
;	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
compares	O
this	O
requirement	O
to	O
a	O
similar	O
one	O
in	O
its	O
own	O
GNU	B-Application
Affero	I-Application
General	I-Application
Public	I-Application
License	I-Application
.	O
</s>
<s>
Many	O
software	O
releases	O
from	O
Apple	O
have	O
now	O
been	O
relicensed	O
under	O
the	O
more	O
liberal	O
Apache	B-Application
License	I-Application
,	O
such	O
as	O
the	O
Bonjour	B-Application
Zeroconf	B-Application
stack	O
.	O
</s>
