<s>
GnuTLS	B-Application
(	O
,	O
the	O
GNU	O
Transport	B-Protocol
Layer	I-Protocol
Security	I-Protocol
Library	B-Library
)	O
is	O
a	O
free	B-Application
software	I-Application
implementation	O
of	O
the	O
TLS	B-Protocol
,	I-Protocol
SSL	I-Protocol
and	O
DTLS	B-Protocol
protocols	O
.	O
</s>
<s>
It	O
offers	O
an	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
for	O
applications	O
to	O
enable	O
secure	O
communication	O
over	O
the	O
network	O
transport	B-Architecture
layer	I-Architecture
,	O
as	O
well	O
as	O
interfaces	O
to	O
access	O
X.509	O
,	O
PKCS	B-General_Concept
#12	I-General_Concept
,	O
OpenPGP	O
and	O
other	O
structures	O
.	O
</s>
<s>
GnuTLS	B-Application
consists	O
of	O
a	O
library	B-Library
that	O
allows	O
client	O
applications	O
to	O
start	O
secure	O
sessions	O
using	O
the	O
available	O
protocols	O
.	O
</s>
<s>
GnuTLS	B-Application
has	O
the	O
following	O
features	O
:	O
</s>
<s>
GnuTLS	B-Application
was	O
initially	O
created	O
around	O
March	O
2003	O
by	O
Nikos	O
Mavrogiannopoulos	O
to	O
allow	O
applications	O
of	O
the	B-Application
GNU	I-Application
Project	I-Application
to	O
use	O
secure	O
protocols	O
such	O
as	O
TLS	B-Protocol
.	O
</s>
<s>
Although	O
OpenSSL	B-Language
already	O
existed	O
,	O
OpenSSL	B-Language
's	O
license	O
is	O
not	O
compatible	O
with	O
the	O
GPL	B-License
;	O
thus	O
software	O
under	O
the	O
GPL	B-License
,	O
such	O
as	O
GNU	O
software	O
,	O
could	O
not	O
use	O
OpenSSL	B-Language
without	O
making	O
a	O
GPL	B-Application
linking	I-Application
exception	I-Application
.	O
</s>
<s>
The	O
GnuTLS	B-Application
library	B-Library
was	O
licensed	B-License
originally	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
v2	O
,	O
while	O
included	O
applications	O
use	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
In	O
August	O
2011	O
the	O
library	B-Library
was	O
updated	O
to	O
the	O
LGPLv3	B-Application
.	O
</s>
<s>
After	O
it	O
was	O
noticed	O
that	O
there	O
were	O
new	O
license	O
compatibility	O
problems	O
introduced	O
,	O
especially	O
with	O
other	O
free	B-Application
software	I-Application
with	O
the	O
license	O
change	O
,	O
after	O
discussions	O
the	O
license	O
was	O
downgraded	O
again	O
to	O
LGPLv2.1	B-Application
in	O
March	O
2013	O
.	O
</s>
<s>
GnuTLS	B-Application
was	O
created	O
for	O
the	B-Application
GNU	I-Application
Project	I-Application
,	O
but	O
in	O
December	O
2012	O
its	O
maintainer	O
,	O
Nikos	O
Mavrogiannopoulos	O
,	O
dissociated	O
the	O
project	O
from	O
GNU	O
after	O
policy	O
disputes	O
with	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
Richard	O
Stallman	O
opposed	O
this	O
move	O
and	O
suggested	O
forking	B-Application
the	O
project	O
instead	O
.	O
</s>
<s>
Soon	O
afterward	O
,	O
developer	O
Paolo	O
Bonzini	O
ended	O
his	O
maintainership	O
of	O
GNU	O
Sed	B-Application
and	O
Grep	B-Application
,	O
expressing	O
concerns	O
similar	O
to	O
those	O
of	O
GnuTLS	B-Application
maintainer	O
Mavrogiannopoulos	O
.	O
</s>
<s>
Software	O
packages	O
using	O
GnuTLS	B-Application
include(d )	O
:	O
</s>
