except perhaps at great effort and expense, you can't gain a monopoly over books on a given topic, and once someone has transferred all of the information out o

except perhaps at great effort and expense, you can't gain a monopoly over books on a given topic, and once someone has transferred all of the information out of your book into their mind by reading it, the book has no enduring value to them. the analogy is more like that of a car manufacturer gaining 90% market share, designing the interface between it and its seats to be proprietary (and preventing other manufacturers from learning about it except through a business agreement with them), then getting into the seat business and making it clear that third-party seat manufacturers make inferior products.