LOL! The author is actually one of my former classmates.
As far as canon law is concerned, it is the Catholic Church's internal legal system. For more information about canon law, and how it interacts with the lay Catholic in the pew, check out the following interview with the same author:
Decoding Canon Law for Lay Catholics -- an interview with Pete Vere
Hope you're pro-life because Vere takes a pretty tough stand against pro-abortion Catholic politicians.
Additionally, if you're interested in finding out more about canon law, Vere and another classmate of ours, Michael Trueman, just published a book that answers the 150 questions about canon law most asked by lay Catholics. The title of the book is
Surprised by Canon Law: 150 Questions Laypeople Ask About Canon Law.