This is an interesting request because is a canonical textbook. However, searching for a “deep paper” about the PDF or its presence on GitHub would not yield a legitimate academic result (that would be a meta-study of piracy).
Instead, I will interpret your request as:
This is an interesting request because is a canonical textbook. However, searching for a “deep paper” about the PDF or its presence on GitHub would not yield a legitimate academic result (that would be a meta-study of piracy).
Instead, I will interpret your request as: