<s>
PowerVu	B-Device
is	O
a	O
conditional	B-Architecture
access	I-Architecture
system	I-Architecture
for	O
digital	B-Application
television	I-Application
developed	O
by	O
Scientific	O
Atlanta	O
.	O
</s>
<s>
PowerVu	B-Device
has	O
decoders	O
that	O
decode	O
signals	O
from	O
certain	O
satellites	O
for	O
cable	O
distribution	O
services	O
.	O
</s>
