PCI Resources volumes are available on the Apple iBook store as well as the Amazon Kindle store
This post is just a summary of changes that have occured but that I've not yet blogged about.
Volumes 1 and 2 were release on the Amazon Kindle store in July 2015. The PCI Resources Scoping Model and Approach, derived from volume 2 and published under a Creative Common license at the same time. Volume 3 was released on the Amazon Kindle store in September 2015.
All 3 volumes were updated in January 2016 to reflect the SSL/TLS changes published by the PCI SSC in December 2015.
All 3 volumes were published on the Apple iBooks store in early March 2016.