This book is an excellent treatises on combat however it is far from the original work of Bruce Lee. Many of the profound observations on fighting presented in this book have been directly taken from two earlier works, The Way of Zen and This is it by Alan Watts. It has been proven that Lee also stolen quotes from fencing and boxing magazines and claimed them as his own thoughts. In the end this is an excellent book comprised by Lee and his family consisting of the thoughts of others on the subject of unarmed combat.It is not the work of a genius but of a thief.
All martial arts have similar techniques (at least to the "theme" of their philosophy)... Lee incorporated multiple styles into his philosophy of combat (similar to Musashi in his book "A book of five rings")... thats not an easy thing to do, you can't just take a hodge podge of techniques and expect them to flow together...
He also took the Dim Mak rules from other schools in Pages 40, 41.
Thanks to Bruce Lee, I now know the rules of Shaolin, Tai Chi, and Praying Mantis on Dim Mak. If you can read Chinese, Congratulations. You will learn the info too in pages 40 and 41.
It is plagarism if he did not give credit to the source of the information. Maybe his university education in Seattle didn't teach him this in writing a book We need to be happy with the info he left for us.
@Unforlorn: If you read the description of this book, you would not have made this comment. These "quotes" are things he learned as he expanded his understanding of Martial Arts. He wrote them down while he was injured and had time to muse about them, and connect them into his Tao. He would certainly have not published these musings, rather he would have written something original that included what he learned from those quotes. This book was put together by people who could not have known what was an original quote and what was drawn from quotes he considered important enough to jot down, but were not his own.