<s>
The	B-Application
Free	I-Application
Software	I-Application
Definition	I-Application
written	O
by	O
Richard	O
Stallman	O
and	O
published	O
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
(	O
FSF	B-Operating_System
)	O
,	O
defines	O
free	B-Application
software	I-Application
as	O
being	O
software	O
that	O
ensures	O
that	O
the	O
end	O
users	O
have	O
freedom	O
in	O
using	O
,	O
studying	O
,	O
sharing	O
and	O
modifying	O
that	O
software	O
.	O
</s>
<s>
The	O
earliest-known	O
publication	O
of	O
the	O
definition	O
was	O
in	O
the	O
February	O
1986	O
edition	O
of	O
the	O
now-discontinued	O
GNU	O
's	O
Bulletin	O
publication	O
by	O
the	O
FSF	B-Operating_System
.	O
</s>
<s>
The	O
canonical	O
source	O
for	O
the	O
document	O
is	O
in	O
the	O
philosophy	O
section	O
of	O
the	B-Application
GNU	I-Application
Project	I-Application
website	O
.	O
</s>
<s>
The	O
FSF	B-Operating_System
publishes	O
a	O
list	B-Application
of	I-Application
licences	I-Application
which	I-Application
meet	I-Application
this	I-Application
definition	I-Application
.	O
</s>
<s>
The	O
definition	O
published	O
by	O
the	O
FSF	B-Operating_System
in	O
February	O
1986	O
had	O
two	O
points	O
:	O
</s>
<s>
In	O
1996	O
,	O
when	O
the	O
gnu.org	B-Application
website	O
was	O
launched	O
,	O
"	O
free	B-Application
software	I-Application
"	O
was	O
defined	O
referring	O
to	O
"	O
three	O
levels	O
of	O
freedom	O
"	O
by	O
adding	O
an	O
explicit	O
mention	O
of	O
the	O
freedom	O
to	O
study	O
the	O
software	O
(	O
which	O
could	O
be	O
read	O
in	O
the	O
two-point	O
definition	O
as	O
being	O
part	O
of	O
the	O
freedom	O
to	O
change	O
the	O
program	O
)	O
.	O
</s>
<s>
The	O
existing	O
freedoms	O
were	O
already	O
numbered	O
one	O
to	O
three	O
,	O
but	O
this	O
freedom	O
should	O
come	O
before	O
the	O
others	O
,	O
so	O
it	O
was	O
added	O
as	O
"	O
freedom	B-Application
zero	I-Application
"	O
.	O
</s>
<s>
The	O
modern	O
definition	O
defines	O
free	B-Application
software	I-Application
by	O
whether	O
or	O
not	O
the	O
recipient	O
has	O
the	O
following	O
four	O
freedoms	O
:	O
</s>
<s>
In	O
July	O
1997	O
,	O
Bruce	O
Perens	O
published	O
the	O
Debian	B-License
Free	I-License
Software	I-License
Guidelines	I-License
.	O
</s>
<s>
A	O
definition	O
based	O
on	O
the	O
DFSG	B-License
was	O
also	O
used	O
by	O
the	O
Open	O
Source	O
Initiative	O
(	O
OSI	O
)	O
under	O
the	O
name	O
"	O
The	B-License
Open	I-License
Source	I-License
Definition	I-License
"	O
.	O
</s>
<s>
Despite	O
the	O
philosophical	O
differences	O
between	O
the	O
free	B-Application
software	I-Application
movement	O
and	O
the	O
open-source-software	O
movement	O
,	O
the	O
official	O
definitions	O
of	O
free	B-Application
software	I-Application
by	O
the	O
FSF	B-Operating_System
and	O
of	O
open-source	B-Application
software	I-Application
by	O
the	O
OSI	O
basically	O
refer	O
to	O
the	O
same	O
software	O
licences	O
,	O
with	O
a	O
few	O
minor	O
exceptions	O
.	O
</s>
<s>
While	O
stressing	O
these	O
philosophical	O
differences	O
,	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
comments	O
:	O
</s>
