Lenslok is a

copy protection Copy protection, also known as content protection, copy prevention and copy restriction, describes measures to enforce copyright by preventing the reproduction of software, films, music, and other media. Copy protection is most commonly found on ...

mechanism found in some computer games and other software on the 8-bit Atari computers, Commodore 64,

ZX Spectrum The ZX Spectrum () is an 8-bit home computer that was developed by Sinclair Research. It was released in the United Kingdom on 23 April 1982, and became Britain's best-selling microcomputer. Referred to during development as the ''ZX81 Colou ...

, Sinclair QL,

MSX MSX is a standardized home computer architecture, announced by Microsoft and ASCII Corporation on June 16, 1983. It was initially conceived by Microsoft as a product for the Eastern sector, and jointly marketed by Kazuhiko Nishi, then vice-p ...

and

Amstrad CPC The Amstrad CPC (short for ''Colour Personal Computer'') is a series of 8-bit home computers produced by Amstrad between 1984 and 1990. It was designed to compete in the mid-1980s home computer market dominated by the Commodore 64 and the S ...

. The first game to use it was ''

Elite In political and sociological theory, the elite (french: élite, from la, eligere, to select or to sort out) are a small group of powerful people who hold a disproportionate amount of wealth, privilege, political power, or skill in a group. ...

'' for the ZX Spectrum.

Overview

Lenslok was released in 1985 as a plastic lens in a foldaway frame. The Lenslok device was essentially a row of

prism Prism usually refers to: * Prism (optics), a transparent optical component with flat surfaces that refract light * Prism (geometry), a kind of polyhedron Prism may also refer to: Science and mathematics * Prism (geology), a type of sedimentary ...

s arranged vertically in a plastic holder. Before the game started, a two-letter code was displayed on the screen, but it was corrupted by being split into vertical bands which were then rearranged on screen. By viewing these bands through the Lenslok they were restored to their correct order and the code could be read and entered allowing access to the game. The device was small enough when folded flat to fit next to an

audio cassette The Compact Cassette or Musicassette (MC), also commonly called the tape cassette, cassette tape, audio cassette, or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback. Invented by Lou Otten ...

in a standard case. In order for the Lenslok to work correctly the displayed image has to be the correct size. This meant that before each use the software needed to be calibrated to take account of the size of the display. Users found this setup particularly annoying, at least in part because they found the instructions that were initially shipped unclear. Additionally, the device could not be calibrated at all for very large and very small televisions, and some games shipped with mismatched Lensloks that prevented the code from being correctly descrambled. The Lenslok system was not used in later releases of ''Elite''.

Software

Lenslok was used only on 11 releases: * '' ACE'', released by Cascade Games * ''

'', released by Firebird * ''The Advanced Music System'', released by Firebird * ''

Fighter Pilot A fighter pilot is a military aviator trained to engage in air-to-air combat, air-to-ground combat and sometimes electronic warfare while in the cockpit of a fighter aircraft. Fighter pilots undergo specialized training in aerial warfare an ...

'', released by Digital Integration * ''

Graphic Adventure Creator Graphic Adventure Creator (often shortened to GAC) is a game creation system/programming language for adventure games published by Incentive Software, originally written on the Amstrad CPC by Sean Ellis, and then ported to other platforms by, amon ...

'', released by Incentive Software * ''

Jewels of Darkness ''Jewels of Darkness'' is a trilogy of text adventure games by Level 9. The individual games were initially released separately in 1982. They featured some themes and names inspired by the books of J. R. R. Tolkien and so became known as the '' ...

'', released by Rainbird * '' OCP Art Studio'', released by Rainbird * '' The Price of Magik'', released by

Level 9 Computing Level 9 was a British developer of computer software, active between 1981 and 1991. Founded by Mike, Nicholas and Pete Austin, the company produced software for the BBC Micro, Nascom, ZX Spectrum, Commodore 64, Oric, Atari, Lynx 48k, RML 380Z, ...

* ''Supercharge'', released by Digital Precision * ''

Tomahawk A tomahawk is a type of single-handed axe used by the many Indigenous peoples and nations of North America. It traditionally resembles a hatchet with a straight shaft. In pre-colonial times the head was made of stone, bone, or antler, and Eur ...

'', released by Digital Integration * ''TT Racer'', released by Digital Integration

References

{{Reflist

External links

Lenslok Instruction Sheet
(PDF file)
Bird Sanctuary - Lenslok
Article containing further details on Lenslok, with photographs.
LensKey
A Lenslok emulator allowing access to

emulated In computing, an emulator is hardware or software that enables one computer system (called the ''host'') to behave like another computer system (called the ''guest''). An emulator typically enables the host system to run software or use peri ...

versions of the games. Copy protection ZX Spectrum Atari 8-bit family

Overview

Software

See also

References

External links