<s>
Search	B-Protocol
engine	I-Protocol
cache	I-Protocol
is	O
a	O
cache	B-General_Concept
of	O
web	O
pages	O
that	O
shows	O
the	O
page	O
as	O
it	O
was	O
when	O
it	O
was	O
indexed	O
by	O
a	O
web	B-Application
crawler	I-Application
.	O
</s>
<s>
When	O
a	O
web	B-Application
crawler	I-Application
crawls	O
the	O
web	O
,	O
it	O
collects	O
the	O
contents	O
of	O
each	O
page	O
to	O
allow	O
the	O
page	O
to	O
be	O
indexed	O
by	O
the	O
search	B-Application
engine	I-Application
.	O
</s>
<s>
The	O
search	B-Application
engine	I-Application
may	O
make	O
the	O
copy	O
accessible	O
to	O
users	O
in	O
the	O
search	B-Application
engine	I-Application
results	O
.	O
</s>
<s>
Web	B-Application
crawlers	I-Application
that	O
obey	O
restrictions	O
given	O
in	O
robots.txt	O
or	O
meta	O
tags	O
by	O
the	O
webmaster	O
may	O
not	O
make	O
a	O
cached	O
copy	O
available	O
to	O
search	B-Application
engine	I-Application
users	O
if	O
instructed	O
not	O
to	O
.	O
</s>
<s>
Search	B-Protocol
engine	I-Protocol
cache	I-Protocol
can	O
be	O
used	O
for	O
crime	O
investigation	O
,	O
legal	O
proceedings	O
and	O
journalism	O
.	O
</s>
<s>
Examples	O
of	O
search	B-Application
engines	I-Application
that	O
offer	O
their	O
users	O
cached	O
versions	O
of	O
web	O
pages	O
are	O
Google	B-Application
Search	I-Application
,	O
Bing	B-Application
,	O
Yandex	B-Application
Search	I-Application
,	O
and	O
Baidu	B-Application
.	O
</s>
<s>
Search	B-Protocol
engine	I-Protocol
cache	I-Protocol
may	O
not	O
be	O
fully	O
protected	O
by	O
the	O
usual	O
laws	O
that	O
protect	O
technology	O
providers	O
from	O
copyright	O
infringement	O
claims	O
.	O
</s>
<s>
Some	O
search	B-Protocol
engine	I-Protocol
caches	I-Protocol
may	O
be	O
equipped	O
with	O
additional	O
functionality	O
such	O
as	O
the	O
ability	O
to	O
view	O
the	O
page	O
as	O
simple	O
unstyled	O
hypertext	O
or	O
its	O
source	O
code	O
,	O
as	O
supported	O
by	O
Google	B-Protocol
Cache	I-Protocol
(	O
"	O
Full	O
version	O
"	O
,	O
"	O
Text-only	O
version	O
"	O
,	O
"	O
View	O
source	O
"	O
)	O
.	O
</s>
