<s>
Portsnap	B-Application
is	O
a	O
system	O
written	O
by	O
Colin	O
Percival	O
for	O
secure	O
distribution	O
of	O
compressed	B-General_Concept
,	O
digitally	O
signed	O
snapshots	O
of	O
the	O
FreeBSD	B-Application
ports	I-Application
tree	I-Application
.	O
</s>
<s>
The	O
distribution	O
follows	O
the	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
model	I-Operating_System
and	O
uses	O
the	O
transport	B-Architecture
protocol	I-Architecture
HTTP	B-Protocol
(	O
pipelined	B-Protocol
HTTP	I-Protocol
)	O
.	O
</s>
<s>
As	O
of	O
FreeBSD	B-Operating_System
6.0	O
,	O
portsnap	B-Application
is	O
a	O
part	O
of	O
the	O
base	O
system	O
(	O
including	O
5.5	O
)	O
.	O
</s>
<s>
The	O
portsnap	B-Application
package	O
is	O
distributed	O
under	O
the	O
2-clause	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
