DJL Software (for "Dave J and John LookerSoftware") is mainly known as the co-author of the [[Speedlock|Speedlock]] protection system, a fastloader . A fast loader and protection used on many cassette games released in the UK, but he and as a protection on disc games. DJL was also the author of several Amstrad games including [[3d Stunt Rider ]] and [[Nigel Mansell's Grand Prix]], in addition to self-published titles such as [[https://www.retrogames.co.uk/041976/Sinclair/Frogger-by-DJL-Software Frogger]]. [[Category:CPC scene members]]