<s>
The	O
Cache	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
(	O
CDP	O
)	O
is	O
an	O
extension	O
to	O
the	O
BitTorrent	B-Protocol
file-distribution	O
system	O
.	O
</s>
<s>
It	O
is	O
designed	O
to	O
support	O
the	O
discovery	O
and	O
utilisation	O
of	O
local	O
data	O
caches	O
by	O
BitTorrent	B-Protocol
peers	O
,	O
typically	O
set	O
up	O
by	O
ISPs	O
wishing	O
to	O
minimise	O
the	O
impact	O
of	O
BitTorrent	B-Protocol
traffic	O
on	O
their	O
network	O
.	O
</s>
<s>
The	O
Cache	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
was	O
originally	O
developed	O
jointly	O
by	O
BitTorrent	B-Protocol
,	O
Inc	O
.	O
and	O
CacheLogic	O
and	O
first	O
implemented	O
in	O
version	O
4.20	O
of	O
the	O
official	B-Protocol
BitTorrent	I-Protocol
client	I-Protocol
,	O
released	O
June	O
22	O
,	O
2006	O
.	O
</s>
