I do not see any thing wrong with rewriting a pattern the professionals do it all the time and sell the books or patterns as their own, for example Square Dance came out pictures of templates to be traced to plastic, I have the book and did the quilt, someone else reprinted called the Twister, included plastic templates, doubled the price another example was Stack and Whack very popular I also have the book did the quilt then someone else rewrote it called it One Block Wonder and sold under their name not very much changed in either book plus there are others even patterns so why would it be fair for some and not others so when I want to rewrite a pattern I do and I have came up with easier ways and taught them at guilds and quilt stores