I am fairly new to quilting, so there may be a protocol I am not familiar with, but I am not new to sewing. I often copied clothes that I had seen when I sew for myself. I never even thought about it being wrong. As long as you don't sell it or claim you created the design, I would think it would be just fine. I will be reading the answers you get though. It may very well be that I am way wrong here.