<s>
Pound	O
is	O
a	O
lightweight	O
open	B-Application
source	I-Application
reverse	B-General_Concept
proxy	I-General_Concept
program	O
and	O
application	B-Protocol
firewall	I-Protocol
suitable	O
to	O
be	O
used	O
as	O
a	O
web	B-Application
server	I-Application
load	B-Application
balancing	I-Application
solution	O
.	O
</s>
<s>
Originally	O
developed	O
by	O
an	O
IT	B-General_Concept
security	O
company	O
,	O
it	B-General_Concept
has	O
a	O
strong	O
emphasis	O
on	O
security	O
.	O
</s>
<s>
The	O
original	O
intent	O
on	O
developing	O
Pound	O
was	O
to	O
allow	O
distributing	O
the	O
load	O
among	O
several	O
Zope	B-Language
servers	O
running	O
on	O
top	O
of	O
ZEO	O
(	O
Zope	B-Language
Extensible	O
Object	O
)	O
.	O
</s>
<s>
However	O
,	O
Pound	O
is	O
not	O
limited	O
to	O
Zope-based	O
installations	O
.	O
</s>
<s>
Using	O
regular	B-Language
expression	I-Language
matching	O
on	O
the	O
requested	O
URLs	O
,	O
Pound	O
can	O
pass	O
different	O
kinds	O
of	O
requests	O
to	O
different	O
backend	O
server	O
groups	O
.	O
</s>
<s>
Pound	O
is	O
distributed	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
and	O
can	O
be	O
used	O
free	O
of	O
charge	O
even	O
in	O
business	O
environments	O
.	O
</s>
