What was stolen? For every edited version sold the companies purchased a retail DVD. Are you telling me that if I draw a Hitler mustache on my copy of Hillary Clinton's book I am somehow "stealing" from her because I didn't get permission?
It doesn't matter, someone else is profiting off of the alteration of a copyrighted work. One that they do not have permission to do.
If you republish something and sell it that is copyrighted, you are breaking the law, it doesn't matter a whit if the retail DVD is still being purchased.
If you purchase joy;rtu's book first and then redact it, no problem.
Why is this so hard for people to understand? We have copywrite laws.