You might find a user on a forum claiming they have a "clean exclusive scan" of the Red Book. Here is the reality of downloading that PDF:
Before hunting for a PDF, you must understand why this specific edition commands such respect. Published in 2016, the 10th edition (authored by John Kessenich, Graham Sellers, and Dave Shreiner) was the first to fully embrace OpenGL 4.5. opengl programming guide 10th edition pdf exclusive
The examples in the Red Book are legendary. The exclusive PDFs usually contain live, copy-pasteable code blocks from the official companion GitHub repository (opengl-redbook). Scanned, pirated versions often have OCR errors that break shader strings (e.g., misreading #version 450 as #version 4S0). You might find a user on a forum
For those who have legal access to the book via a university or workplace, here is the exclusive roadmap the 10th edition provides: The examples in the Red Book are legendary