<s>
Viaccess	B-Device
is	O
a	O
conditional	B-Architecture
access	I-Architecture
system	I-Architecture
edit	O
by	O
Orange	O
S.A.	O
</s>
<s>
There	O
are	O
six	O
versions	O
in	O
use	O
today	O
,	O
Viaccess	B-Device
PC2.3	O
,	O
Viaccess	B-Device
PC2.4	O
,	O
Viaccess	B-Device
PC2.5	O
,	O
Viaccess	B-Device
PC2.6	O
,	O
Viaccess	B-Device
ACS3.x/Prime	O
Sentinel	O
,	O
Viaccess	B-Device
ACS4.1	O
,	O
Viaccess	B-Device
ACS5.0	O
,	O
and	O
Viaccess	B-Device
ACS6.x/Adaptive	O
Sentinel	O
.	O
</s>
<s>
Viaccess	B-Device
was	O
developed	O
as	O
the	O
digital	O
version	O
of	O
the	O
EuroCrypt	B-Device
system	O
used	O
with	O
the	O
hybrid	O
MAC	O
system	O
,	O
</s>
<s>
The	O
first	O
version	O
is	O
sometimes	O
referred	O
to	O
as	O
Viaccess	B-Device
1	O
,	O
and	O
the	O
latter	O
three	O
,	O
although	O
different	O
,	O
as	O
Viaccess	B-Device
2	O
.	O
</s>
<s>
PC2.3	O
and	O
PC2.4	O
are	O
known	O
to	O
be	O
ineffective	O
,	O
and	O
many	O
set-top	O
boxes	O
can	O
be	O
'	O
patched	O
 '	O
to	O
decrypt	O
Viaccess	B-Device
signals	O
without	O
payment	O
,	O
however	O
PC2.5	O
and	O
PC2.6	O
are	O
secure	O
,	O
with	O
PC2.5	O
remaining	O
secure	O
two	O
years	O
after	O
its	O
first	O
commercial	O
deployment	O
.	O
</s>
<s>
There	O
are	O
two	O
modifications	O
of	O
Viaccess	B-Device
PC2.3	O
in	O
use	O
.	O
</s>
<s>
In	O
2008	O
,	O
Viaccess	B-Device
acquired	O
Orca	O
interactive	O
and	O
in	O
2012	O
they	O
merge	O
under	O
the	O
name	O
Viaccess-Orca	O
.	O
</s>
<s>
The	O
second	O
Viaccess	B-Device
modification	O
,	O
called	O
ThalesCrypt	O
,	O
is	O
used	O
by	O
Canal	O
Satellite	O
France	O
to	O
protect	O
its	O
contents	O
on	O
the	O
transport	O
network	O
to	O
the	O
head-ends	O
of	O
the	O
cable	O
networks	O
;	O
it	O
is	O
an	O
over-encryption	O
mechanism	O
of	O
the	O
original	O
protocol	O
encryption	O
keys	O
.	O
</s>
<s>
Viaccess	B-Device
is	O
currently	O
used	O
by	O
a	O
large	O
number	O
of	O
providers	O
.	O
</s>
<s>
Viaccess	B-Device
is	O
the	O
3rd	O
largest	O
conditional	B-Architecture
access	I-Architecture
system	I-Architecture
provider	O
in	O
the	O
world	O
(	O
in	O
2004	O
)	O
.	O
</s>
<s>
Viaccess	B-Device
is	O
also	O
a	O
subsidiary	O
of	O
Orange	O
S.A.	O
which	O
offers	O
pay	O
TV	O
and	O
DRM	O
enabled	O
software	O
.	O
</s>
<s>
is	O
a	O
subsidiary	O
of	O
Viaccess	B-Device
which	O
offers	O
IPTV	O
Middleware	O
since	O
2008	O
.	O
</s>
