<s>
The	O
Standard	B-Protocol
Interchange	I-Protocol
Protocol	I-Protocol
is	O
a	O
proprietary	O
standard	O
for	O
communication	O
between	O
library	O
computer	O
systems	O
and	O
self-service	O
circulation	O
terminals	O
.	O
</s>
<s>
Version	O
2.0	O
of	O
the	O
protocol	O
,	O
known	O
as	O
"	O
SIP2	B-Protocol
"	O
,	O
is	O
a	O
de	O
facto	O
standard	O
for	O
library	O
self-service	O
applications	O
.	O
</s>
<s>
SIP2	B-Protocol
was	O
widely	O
adopted	O
by	O
library	O
automation	O
vendors	O
,	O
including	O
ODILO	O
,	O
Bibliotheca	O
,	O
Nedap	O
,	O
Checkpoint	O
,	O
Envisionware	O
,	O
FE	O
Technologies	O
,	O
Meescan	O
,	O
Redia	O
and	O
open	B-License
source	I-License
integrated	O
library	O
system	O
software	O
such	O
as	O
Koha	B-Language
and	O
Evergreen	B-Language
.	O
</s>
<s>
The	O
standard	O
was	O
the	O
basis	O
for	O
the	O
NISO	B-Protocol
Circulation	I-Protocol
Interchange	I-Protocol
Protocol	I-Protocol
(	O
NCIP	O
)	O
standard	O
which	O
is	O
eventually	O
intended	O
to	O
replace	O
it	O
.	O
</s>
<s>
Two	O
common	O
methods	O
are	O
to	O
use	O
either	O
stunnel	B-Protocol
or	O
SSH	B-Protocol
to	O
add	O
a	O
layer	O
of	O
encryption	O
and/or	O
an	O
extra	O
level	O
of	O
authentication	O
.	O
</s>
