Track Trap was a supplement to the Software Protection handbook.
The most unusual and innovative protection analysis tool for the Commodore yet.
This book came out BEFORE the Commodore 64 version. This is a 84 page manual that shows you how to duplicate protected Vic-20 software. This book and many other great ones can be found online at: Bombjack.org webpage.
Kracker Jax Trilogy contained the three Kracker Jax Revealed books in one.
See the Hack U, ad on here for more info. This is a must have book if you are interested in Commodore copy protection schemes. Also includes information about ‘Rapidlok’ copy protection. Also V-Max! protection. This book can also be found today in PDF format on Commodore search site.