Here is an example (albeit a simple one) of how Biker's advice could help...
Originally Posted by Faitmaker
August 2009, you read Mas's book and mail it on. January 2010 you shoot a scumbag wielding a knife at you. You end up at trial.
Prosecutor: "Mr. Smith here says he was only defending himself, and yet forensics clearly puts the shooting victim almost twenty feet away from him! How can that be defense???"
Mr. Smith: "I know about the Tueller Drill, and that a knife can beat a gun out to seven yards in a situation like that."
Prosecutor: "You are a lying, cheating, Internet commando who only read that Tueller nonsense last week in an attempt to save your own bacon!"
Mr. Smith: "Uh, actually, I have the proof here that I read that information over a year ago in a work by a reputable lethal force expert. It was part of my working knowledge at the time I was faced with the decision to shoot. Please have a look at Exhibit 27, the photocopy of the front-piece of that book bearing my signature and proof of date of delivery and forwarding."
The point is, in a self-defense shooting the knowledge you had at the time of the shooting is a valuable part of convincing a jury that you made a reasonable and justified decision. Proving what you knew when is important.
And I am not worried about Mas's royalties, either. If one person who reads it signs up for an LFI course he otherwise never would have taken, I think Mas'd see that as a fair trade off.