<s>
RPC-1	B-Device
and	O
RPC-2	B-Device
are	O
designations	O
applied	O
to	O
firmware	B-Application
for	O
DVD	O
drives	O
.	O
</s>
<s>
Older	O
DVD	O
drives	O
use	O
RPC-1	B-Device
firmware	I-Device
,	O
which	O
allows	O
DVDs	O
from	O
any	O
region	O
to	O
play	O
.	O
</s>
<s>
Newer	O
drives	O
use	O
RPC-2	B-Device
firmware	I-Device
,	O
which	O
enforces	O
DVD	O
region	O
coding	O
at	O
the	O
hardware	O
level	O
.	O
</s>
<s>
Some	O
RPC-2	B-Device
drives	O
can	O
be	O
converted	O
to	O
RPC-1	B-Device
with	O
the	O
same	O
features	O
as	O
before	O
by	O
using	O
alternative	O
firmware	B-Application
on	O
the	O
drive	O
,	O
or	O
on	O
some	O
drives	O
by	O
setting	O
a	O
secret	O
flag	O
in	O
the	O
drive	O
's	O
EEPROM	B-General_Concept
.	O
</s>
