<s>
The	O
Shared	B-License
Source	I-License
Initiative	I-License
(	O
SSI	O
)	O
is	O
a	O
source-available	B-License
software	I-License
licensing	O
scheme	O
launched	O
by	O
Microsoft	O
in	O
May	O
2001	O
.	O
</s>
<s>
Microsoft	O
's	O
Shared	B-License
Source	I-License
Initiative	I-License
allows	O
individuals	O
and	O
organizations	O
to	O
access	O
Microsoft	O
's	O
source	O
code	O
for	O
reference	O
(	O
e.g.	O
</s>
<s>
Two	O
of	O
them	O
,	O
Microsoft	B-License
Public	I-License
License	I-License
and	O
Microsoft	B-License
Reciprocal	I-License
License	I-License
,	O
have	O
been	O
approved	O
by	O
the	O
Open	O
Source	O
Initiative	O
as	O
open	O
source	O
licenses	O
and	O
are	O
regarded	O
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
as	O
free	B-License
software	I-License
licenses	I-License
.	O
</s>
<s>
Other	O
shared	B-License
source	I-License
licenses	I-License
are	O
proprietary	O
,	O
and	O
thus	O
allow	O
the	O
copyright	O
holder	O
to	O
retain	O
tighter	O
control	O
over	O
the	O
use	O
of	O
their	O
product	O
.	O
</s>
<s>
Microsoft	O
's	O
Shared	B-License
Source	I-License
Initiative	I-License
has	O
been	O
imitated	O
by	O
other	O
companies	O
such	O
as	O
RISC	O
OS	O
Open	O
Ltd	O
.	O
</s>
<s>
Microsoft	O
also	O
uses	O
specific	O
licenses	O
for	O
some	O
of	O
their	O
products	O
,	O
such	O
as	O
the	O
Shared	B-Application
Source	I-Application
CLI	I-Application
License	O
and	O
the	O
Microsoft	B-Application
Windows	I-Application
Embedded	O
CE	O
6.0	O
Shared	B-License
Source	I-License
License	I-License
.	O
</s>
<s>
The	O
following	O
licenses	O
are	O
considered	O
open-source	O
by	O
the	O
Open	O
Source	O
Initiative	O
and	O
free	B-License
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
Initially	O
titled	O
Microsoft	O
Permissive	O
License	O
,	O
it	O
was	O
renamed	O
to	O
Microsoft	B-License
Public	I-License
License	I-License
while	O
being	O
reviewed	O
for	O
approval	O
by	O
the	O
Open	O
Source	O
Initiative	O
(	O
OSI	O
)	O
.	O
</s>
<s>
The	O
license	O
was	O
approved	O
on	O
October	O
12	O
,	O
2007	O
,	O
along	O
with	O
the	O
Ms-RL	B-License
.	O
</s>
<s>
According	O
to	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
,	O
it	O
is	O
a	O
free	B-License
software	I-License
license	I-License
but	O
not	O
compatible	O
with	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
Ms-PL	O
provides	O
a	O
free	B-License
and	O
flexible	O
licensing	O
for	O
developers	O
using	O
source	O
codes	O
under	O
this	O
license	O
.	O
</s>
<s>
However	O
,	O
the	O
Ms-PL	O
is	O
a	O
copyleft	B-License
license	I-License
because	O
it	O
requires	O
the	O
source	O
code	O
of	O
software	O
it	O
governs	O
to	O
be	O
distributed	O
only	O
under	O
the	O
same	O
license	O
(	O
the	O
Ms-PL	O
)	O
.	O
</s>
<s>
This	O
Microsoft	O
license	O
allows	O
for	O
distribution	O
of	O
derived	O
code	O
so	O
long	O
as	O
the	O
modified	O
source	O
files	O
are	O
included	O
and	O
retain	O
the	O
Ms-RL	B-License
.	O
</s>
<s>
The	O
Ms-RL	B-License
allows	O
those	O
files	O
in	O
the	O
distribution	O
that	O
do	O
not	O
contain	O
code	O
originally	O
licensed	O
under	O
Ms-RL	B-License
to	O
be	O
licensed	O
according	O
to	O
the	O
copyright	O
holder	O
's	O
choosing	O
.	O
</s>
<s>
This	O
is	O
similar	O
,	O
but	O
not	O
the	O
same	O
as	O
the	O
CDDL	B-Application
,	O
EPL	B-License
or	O
LGPL	B-Application
(	O
GPL	B-License
with	O
a	O
typical	O
"	O
linking	O
exception	O
"	O
)	O
.	O
</s>
<s>
On	O
December	O
9	O
,	O
2005	O
,	O
the	O
Ms-RL	B-License
license	O
was	O
submitted	O
to	O
the	O
Open	O
Source	O
Initiative	O
for	O
approval	O
by	O
John	O
Cowan	O
.	O
</s>
<s>
At	O
the	O
O'Reilly	O
Open	O
Source	O
Convention	O
in	O
July	O
2007	O
,	O
Bill	O
Hilf	O
,	O
director	O
of	O
Microsoft	O
's	O
work	O
with	O
open	O
source	O
projects	O
,	O
announced	O
that	O
Microsoft	O
had	O
formally	O
submitted	O
Ms-PL	O
and	O
Ms-RL	B-License
to	O
OSI	O
for	O
approval	O
.	O
</s>
<s>
According	O
to	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
,	O
it	O
is	O
a	O
free	B-License
software	I-License
license	I-License
but	O
not	O
compatible	O
with	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
The	O
following	O
source-available	B-License
software	I-License
licenses	I-License
have	O
limitations	O
that	O
prevent	O
them	O
from	O
being	O
open-source	O
according	O
to	O
the	O
Open	O
Source	O
Initiative	O
and	O
free	B-License
to	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
This	O
is	O
a	O
version	O
of	O
the	O
Microsoft	B-License
Public	I-License
License	I-License
in	O
which	O
rights	O
are	O
only	O
granted	O
to	O
developers	O
of	O
Microsoft	O
Windows-based	O
software	O
.	O
</s>
<s>
It	O
is	O
also	O
considered	O
to	O
be	O
non-free	O
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
due	O
to	O
this	O
restriction	O
.	O
</s>
<s>
This	O
is	O
a	O
version	O
of	O
the	O
Microsoft	B-License
Reciprocal	I-License
License	I-License
in	O
which	O
rights	O
are	O
only	O
granted	O
when	O
developing	O
software	O
for	O
a	O
Microsoft	B-Application
Windows	I-Application
platform	O
.	O
</s>
<s>
Like	O
the	O
Ms-LPL	O
,	O
this	O
license	O
is	O
not	O
open	O
source	O
because	O
it	O
is	O
not	O
technology-neutral	O
due	O
to	O
its	O
restriction	O
that	O
licensed	O
software	O
must	O
be	O
used	O
on	O
Windows	O
,	O
and	O
is	O
also	O
not	O
considered	O
free	B-License
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
due	O
to	O
this	O
restriction	O
.	O
</s>
<s>
This	O
is	O
the	O
most	O
restrictive	O
of	O
the	O
Microsoft	O
Shared	B-License
Source	I-License
licenses	I-License
.	O
</s>
<s>
The	O
license	O
has	O
previously	O
been	O
abbreviated	O
Ms-RL	B-License
,	O
but	O
Ms-RL	B-License
now	O
refers	O
to	O
the	O
Microsoft	B-License
Reciprocal	I-License
License	I-License
.	O
</s>
<s>
Two	O
specific	O
shared	B-License
source	I-License
licenses	I-License
are	O
interpreted	O
as	O
free	B-Application
software	I-Application
and	O
open	O
source	O
licenses	O
by	O
FSF	B-Operating_System
and	O
OSI	O
.	O
</s>
<s>
The	O
Shared	B-License
Source	I-License
Initiative	I-License
has	O
also	O
been	O
noted	O
to	O
increase	O
the	O
problem	O
of	O
license	B-License
proliferation	I-License
.	O
</s>
