<s>
Optic	B-Application
Nerve	I-Application
is	O
a	O
mass	O
surveillance	O
programme	O
run	O
by	O
the	O
British	O
signals	O
intelligence	O
agency	O
Government	O
Communications	O
Headquarters	O
(	O
GCHQ	O
)	O
,	O
with	O
help	O
from	O
the	O
US	O
National	O
Security	O
Agency	O
,	O
that	O
surreptitiously	O
collects	O
private	O
webcam	B-Protocol
still	O
images	O
from	O
users	O
while	O
they	O
are	O
using	O
a	O
Yahoo	B-Application
!	I-Application
</s>
<s>
webcam	B-Protocol
application	O
.	O
</s>
<s>
As	O
an	O
example	O
of	O
the	O
scale	O
,	O
in	O
one	O
6-month	O
period	O
,	O
the	O
programme	O
is	O
reported	O
to	O
have	O
collected	O
images	O
from	O
1.8	O
million	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Optic	B-Application
Nerve	I-Application
as	O
described	O
in	O
the	O
documents	O
collected	O
one	O
still	O
image	O
every	O
5	O
minutes	O
per	O
user	O
,	O
attempting	O
to	O
comply	O
with	O
human	O
rights	O
legislation	O
.	O
</s>
<s>
The	O
choice	O
of	O
Yahoo	B-Application
!	I-Application
</s>
<s>
for	O
surveillance	O
was	O
taken	O
because	O
"	O
Yahoo	B-Application
webcam	B-Protocol
is	O
known	O
to	O
be	O
used	O
by	O
GCHQ	O
targets	O
"	O
.	O
</s>
<s>
Yahoo	B-Application
!	I-Application
</s>
<s>
Though	O
there	O
were	O
some	O
limits	O
to	O
which	O
photos	O
security	O
analysts	O
were	O
allowed	O
to	O
see	O
,	O
with	O
bulk	O
searches	O
limited	O
to	O
metadata	O
,	O
security	O
analysts	O
were	O
allowed	O
to	O
see	O
"	O
webcam	B-Protocol
images	O
associated	O
with	O
similar	O
Yahoo	B-Application
identifiers	O
to	O
your	O
known	O
target	O
"	O
.	O
</s>
<s>
Optic	B-Application
Nerve	I-Application
worked	O
by	O
collecting	O
the	O
information	O
from	O
GCHQ	O
's	O
large	O
network	O
of	O
Internet	B-Device
cable	I-Device
taps	I-Device
,	O
feeding	O
into	O
systems	O
provided	O
by	O
the	O
United	O
States	O
 '	O
National	O
Security	O
Agency	O
.	O
</s>
<s>
NSA	O
research	O
was	O
used	O
to	O
build	O
the	O
tool	O
to	O
isolate	O
the	O
webcam	B-Protocol
traffic	O
.	O
</s>
<s>
Given	O
that	O
both	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Messenger	O
chats	O
and	O
webcam	B-Protocol
streams	O
are	O
sent	O
unencrypted	O
,	O
it	O
would	O
have	O
been	O
relatively	O
easy	O
(	O
though	O
not	O
trivial	O
)	O
to	O
intercept	O
the	O
webcam	B-Protocol
traffic	O
.	O
</s>
<s>
Following	O
the	O
Snowden	O
leaks	O
,	O
Yahoo	B-Application
!	I-Application
</s>
<s>
planned	O
to	O
give	O
all	O
users	O
the	O
option	O
to	O
encrypt	O
all	O
communications	O
with	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Between	O
3%	O
and	O
11%	O
of	O
the	O
images	O
captured	O
by	O
the	O
webcams	B-Protocol
were	O
sexually	O
explicit	O
in	O
nature	O
and	O
deemed	O
"	O
undesirable	O
nudity	O
"	O
.	O
</s>
<s>
The	O
documents	O
mentioned	O
interest	O
in	O
monitoring	O
the	O
video	O
from	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
Xbox	B-Device
One	I-Device
's	O
Kinect	B-Algorithm
camera	O
,	O
something	O
which	O
Microsoft	O
has	O
reported	O
it	O
was	O
oblivious	O
to	O
.	O
</s>
