<s>
Lenslok	B-Device
is	O
a	O
copy	B-Application
protection	I-Application
mechanism	O
found	O
in	O
some	O
computer	O
games	O
and	O
other	O
software	O
on	O
the	O
8-bit	B-Device
Atari	I-Device
computers	O
,	O
Commodore	O
64	O
,	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
Sinclair	B-Device
QL	I-Device
,	O
MSX	B-Operating_System
and	O
Amstrad	B-Device
CPC	I-Device
.	O
</s>
<s>
The	O
first	O
game	O
to	O
use	O
it	O
was	O
Elite	B-Application
for	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
.	O
</s>
<s>
Lenslok	B-Device
was	O
released	O
in	O
1985	O
as	O
a	O
plastic	O
lens	O
in	O
a	O
foldaway	O
frame	O
.	O
</s>
<s>
The	O
Lenslok	B-Device
device	O
was	O
essentially	O
a	O
row	O
of	O
prisms	O
arranged	O
vertically	O
in	O
a	O
plastic	O
holder	O
.	O
</s>
<s>
By	O
viewing	O
these	O
bands	O
through	O
the	O
Lenslok	B-Device
they	O
were	O
restored	O
to	O
their	O
correct	O
order	O
and	O
the	O
code	O
could	O
be	O
read	O
and	O
entered	O
allowing	O
access	O
to	O
the	O
game	O
.	O
</s>
<s>
The	O
device	O
was	O
small	O
enough	O
when	O
folded	O
flat	O
to	O
fit	O
next	O
to	O
an	O
audio	B-Device
cassette	I-Device
in	O
a	O
standard	O
case	O
.	O
</s>
<s>
In	O
order	O
for	O
the	O
Lenslok	B-Device
to	O
work	O
correctly	O
the	O
displayed	O
image	O
has	O
to	O
be	O
the	O
correct	O
size	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
device	O
could	O
not	O
be	O
calibrated	O
at	O
all	O
for	O
very	O
large	O
and	O
very	O
small	O
televisions	O
,	O
and	O
some	O
games	O
shipped	O
with	O
mismatched	O
Lensloks	B-Device
that	O
prevented	O
the	O
code	O
from	O
being	O
correctly	O
descrambled	O
.	O
</s>
<s>
The	O
Lenslok	B-Device
system	O
was	O
not	O
used	O
in	O
later	O
releases	O
of	O
Elite	B-Application
.	O
</s>
<s>
Lenslok	B-Device
was	O
used	O
only	O
on	O
12	O
releases	O
:	O
</s>
