Changes
'''Speedlock ''' is the name of a disc and cassette copy protection designed by Dave Looker ([[DJL]]) and Dave Aubrey-Jones. Earlier versions mentioned DJL Software later versions mentioned "Speedlock Associates".
== Cassette ==
As the protection system continued to evolve, programs such as [[Soft-Lok]] and the [[Bonzo Blitz]] were upgraded to break the protection.
== Disc ==
Speedlock was also available in disc version. One version called "8k Speedlock", relied on the fact that the CPC's hardware could reliably read but not write 8k sectors.
There were two methods to get around this:
