Update README.md

Author: lizwar

README.md

@@ -37,6 +37,8 @@ The textbook is suitable for use in Electronic and Computer Engineering (ECE), E
 ## License
 You are free to fork, clone or download this book in PDF format for personal, non-commercial use only. 
 You may reprint or republish portions of the text for non-commercial, educational or research purposes but only if there is an attribution to Arm Education.
+This book and the individual contributions contained in it are protected under copyright by the
+Publisher (other than as may be noted herein). Nothing in this license grants you any right to modify the whole, or portions of, this book.
 
 ## Inclusive Language Commitment
 Arm is committed to making the language we use inclusive, meaningful, and respectful. Our goal is to remove and replace non-inclusive language from our vocabulary to reflect our values and represent our global ecosystem.