I totally agree with Fons and Porter's policy. I think these things should be made clear on patterns sold retail also.
For example, I looked at the current quilt I am making to check out what it says. Niemeyer says the papers, instructions etc are sold as a kit and the papers cannot be reproduced. BUT she never states permissions etc and it would be one more sentence to state her policy on consents to show or sell. Seems a simple courtesy to somebody who is spending money on your product.