Found this on Wikipaedia:
"Trademark and copyright issues
There has been contention over who if anyone controls the legal rights to the word "Permaculture", meaning is it trademarked or copyrighted, and if so, who holds the legal rights to the use of the word. For a long time Bill Mollison claimed to have copyrighted the word permaculture, and his books reflected that on the copyright page, saying "The contents of this book and the word PERMACULTURE are copyright." These statements were largely accepted at face-value within the permaculture community. However, copyright law does not protect names, ideas, concepts, systems, or methods of doing something; it only protects the expression or the description of an idea, not the idea itself. Eventually Mollison acknowledged that he was mistaken and that no copyright protection existed for the word "permaculture".
In 2000 Mollison's US based Permaculture Institute sought a service mark (a form of trademark) for the word permaculture when used in educational services such as conducting classes, seminars, or workshops. The service mark would have allowed Mollison and his two Permaculture Institutes (one in the US and one in Australia) to set enforceable guidelines as to how permaculture could be taught and who could teach it, particularly with relation to the PDC. The service mark failed and was abandoned in 2001. Also in 2001 Mollison applied for trademarks in Australia for the terms "Permaculture Design Course" and "Permaculture Design". These applications were both withdrawn in 2003. In 2009 he sought a trademark for "Permaculture: A Designers' Manual" and "Introduction to Permaculture", the names of two of his books. These applications were withdrawn in 2011. There has never been a trademark for the word Permaculture in Australia."