That's not what is going on. A company is taking another product, altering it, and then selling it. That's not comparable to what you just posted. You altered that book yourself after buying (hypothetically...). It was not copied and reprinted in that altered form and then sold. That's the difference.
For each altered copy, an original one was purchased. This company isn't buying one copy, altering it, and then mass-selling tons of videos off of only one purchase. (IOW, it's not piracy.)
As for the sale aspect, do you think you'd have the right to resell that single book you bought (hypothetically) if you crossed out a few words with black marker?