<s>
Autoroll	B-Protocol
(	O
also	O
Key	O
Autoroll	B-Protocol
)	O
refers	O
to	O
TV-signal	O
decryption	O
software	O
that	O
automatically	O
updates	O
a	O
video	O
receiver	O
's	O
or	O
DVR/receiver	O
'	O
s	O
IDEA	B-Algorithm
keys	O
when	O
the	O
transmitting	O
signal	O
provider	O
changes	O
its	O
block	O
cipher	O
algorithm	O
.	O
</s>
<s>
Mention	O
of	O
autoroll	B-Protocol
software	O
often	O
figures	O
in	O
discussions	O
of	O
free-to-air	O
satellite	O
TV	O
receivers	O
,	O
for	O
which	O
it	O
is	O
a	O
vital	O
component	O
.	O
</s>
<s>
Some	O
form	O
of	O
autoroll	B-Protocol
software	O
is	O
also	O
a	O
standard	O
component	O
in	O
pay-TV	O
providers	O
 '	O
smart	O
cards	O
,	O
which	O
allow	O
subscription	O
TV	O
services	O
to	O
guard	O
against	O
signal	O
piracy	O
.	O
</s>
<s>
Often	O
TV	O
pirates	O
will	O
hack	O
a	O
TV	O
subscription-service	O
provider	O
's	O
smart	O
cards	O
and	O
reprogram	O
them	O
with	O
an	O
autoroll	B-Protocol
for	O
all	O
the	O
subscription	O
service	O
's	O
channels	O
.	O
</s>
<s>
Though	O
providers	O
like	O
DIRECTV	O
and	O
DISH	O
Network	O
have	O
attempted	O
to	O
use	O
weekly	O
ECMs	B-Application
,	O
or	O
"	O
electronic	O
countermeasures	O
,	O
"	O
to	O
disrupt	O
these	O
illegal	O
cards	O
,	O
many	O
websites	O
provide	O
updated	O
autoroll	B-Protocol
codes	O
impervious	O
to	O
ECMs	B-Application
and	O
offer	O
this	O
software	O
for	O
a	O
monthly	O
subscription	O
fee	O
less	O
than	O
the	O
service	O
provider	O
's	O
monthly	O
fees	O
.	O
</s>
<s>
Because	O
subscription	O
TV	O
providers	O
tend	O
not	O
to	O
discuss	O
the	O
methods	O
by	O
which	O
they	O
encrypt	O
and	O
decrypt	O
their	O
signals	O
,	O
mention	O
of	O
"	O
autoroll	B-Protocol
"	O
software	O
and	O
"	O
autorolling	O
"	O
on	O
a	O
website	O
usually	O
indicates	O
that	O
the	O
website	O
's	O
owners	O
are	O
engaged	O
in	O
illegal	O
TV	O
piracy	O
.	O
</s>
