Earlier versions mentioned "DJL Software" later versions mentioned "Speedlock Associates".
== Cassette ==
Later versions had multicoloured stripes for the leader/pilot tone, and then blue/black stripes for the data.
As the protection system continued to evolve, programs such as [[Soft-Lok]] and the [[Bonzo Blitz]] were upgraded to break the protection. The speedlock tape protections in their Amstrad CPC versions only use 4 different types of encoding : Speedlock type 1 : *11 A Side Soccer*3D star Fighter*Advanced Pinball sim.*Arcade Flight Sim.*Arkanoid*Beach Head*Beach Head II*Bmx Simulator*Death Stalker*Express Raider*Fruit Machine Sim.*Grand Prix II*Green Beret*Head Over Heels*Hyper Sports*Impossible Mission*International Rugby*Italian Super Car*Kong Strikes Back*Kung Fu Masters*Leaderboard*Mikie*Mission 1 Project Volcano*Ninja Massacre*Ping Pong*Pro Skateboard sim.*Pro Tennis Sim.*Raid!!*SAS combat Sim.*Super Heroes*Super Stuntman*Super Tank Speedlock type 2 : *Arkanoid Revenge of Doh,*Army Moves UK,*Basket Master,*Crazy Cars,*Deliverance Stormlord II,*Gryzor,*Mercenary L'evasion de Targ,*Nigel Mansell GP,*Renegade (Hitsquad),*Road Runner,*Robocop,*Stallone Cobra,*Tank,*Target Renegade,*Tarzan,*The New Zealand Story,*World Games Speedlock type 3 : *Altered Beast,*Back To the Future III,*Bad Dudes vs Dragon Ninja,*Batman the Movie,*Fighter Bomber,*Guerrilla War,*Hammerfist,*Monty Python Flying circus,*Mutants 64k,*Ocean Beach Volley,*Operation Wolf,*Operation Thunderbolt,*P47 Freedom Fighter,*Rainbow Islands,*SDI (activision)*Shinobi,*Star control,*Stormlord,*Super Wonderboy in monsterland,*The Addams Family 128k,*The Ninja Warriors,*The Untouchables,*Turrican II The Final Fight,*Typhoon,*Wizball, Speedlock type 4 : *Cabal*Midnight Resistance*Chase HQ
== Disc ==