VIDEO : How Dis Marvel Avoid Spoilers For 'Infinity War'?

There is a new book out, full of interesting facts about the 'Infinity War.'
The book is Marvel?s Avengers: Infinity War - The Art of the Movie.
According to Uproxx the book is a must read for all fans of the Marvel Cinematic Universe.
How did Marvel prevent the movie's mind blowing spoilers from leaking?
Members of the production crew were given sham scripts, to prevent any possible leaks.
---We had to let them know that those were fake versions of the script that they read.---