<s>
P2PSP	B-Protocol
(	O
Peer	O
to	O
Peer	O
Straightforward	O
Protocol	O
)	O
is	O
a	O
communication	O
protocol	O
of	O
the	O
application	O
layer	O
for	O
streaming	O
multimedia	O
content	O
on	O
the	O
Internet	O
,	O
that	O
is	O
,	O
where	O
users	O
play	O
the	O
stream	O
in	O
sync	O
.	O
</s>
<s>
Unlike	O
traditional	O
CS	O
(	O
Client-Server	B-Operating_System
)	O
and	O
CDN	O
(	O
Content	B-Operating_System
Delivery	I-Operating_System
Network	I-Operating_System
)	O
based	O
video	O
streaming	O
,	O
P2P	O
contributes	O
its	O
upstream	O
bandwidth	O
to	O
the	O
system	O
.	O
</s>
<s>
Therefore	O
,	O
in	O
general	O
,	O
P2P	O
systems	O
are	O
more	O
scalable	O
architectures	O
based	O
on	O
the	O
model	O
client-server	B-Operating_System
.	O
</s>
<s>
The	O
P2PSP	B-Protocol
has	O
been	O
specially	O
defined	O
for	O
streaming	O
live	O
footage	O
.	O
</s>
<s>
Star	B-Architecture
Network	I-Architecture
where	O
there	O
are	O
some	O
sources	O
and	O
every	O
peer	O
is	O
connected	O
to	O
one	O
of	O
the	O
server	O
directly	O
.	O
</s>
