<s>
Design	O
rules	O
are	O
maintained	O
and	O
released	O
by	O
a	O
semiconductor	B-Algorithm
foundry	I-Algorithm
for	O
its	O
customers	O
(	O
layout	O
designers	O
of	O
integrated	O
circuits	O
)	O
to	O
follow	O
.	O
</s>
<s>
Restrictive	B-Algorithm
design	I-Algorithm
rules	I-Algorithm
(	O
RDRs	O
)	O
curtail	O
some	O
of	O
the	O
"	O
freedom	O
"	O
layout	O
designers	O
have	O
traditionally	O
had	O
with	O
regular	O
design	O
rules	O
in	O
less	O
advanced	O
process	O
technologies	O
.	O
</s>
<s>
To	O
achieve	O
and	O
maintain	O
an	O
acceptable	O
return	O
on	O
investment	O
for	O
its	O
customers	O
and	O
by	O
extension	O
for	O
itself	O
,	O
a	O
foundry	B-Algorithm
may	O
be	O
compelled	O
,	O
for	O
technological	O
reasons	O
,	O
to	O
adopt	O
RDRs	O
to	O
better	O
ensure	O
the	O
completed	O
layout	O
design	O
of	O
an	O
integrated	O
circuit	O
is	O
manufacturable	O
with	O
a	O
desired	O
yield	O
in	O
more	O
advanced	O
process	O
technologies	O
.	O
</s>
