The interesting part of this post is that you had used EQ to design your lone star. THEN someone said they had seen your design in a book. When you tracked down the book, there was indeed one like it or similar. That cannot possibly be an infringement. After all, quilting is about taking shapes and colors and manipulating their placement. If we just plain copy someone else's plan, we have copied. If we do not use that book and move things around on our design board-that is very different. Yes, this copyright thing has gone way out of what had been intentioned and is widely misunderstood. You are on safe territory. Enjoy your design and don't worry about it.