About protection: I see book is in github as a public repo.
I will try to print with my pdf tools.
Please give me some time.
With the right tools, it can likely be used to compile the book into a proper PDF, rather than using print workarounds.
Seems, reading the book on the browser is the only option, that is how I did it since many weeks.
Fortunately, as mentioned in my post at the root level, there's PDFs available in the usual archivist libraries.