I'm sure you will find the same is true with quilt patterns, even when the pattern is free. You can make the pattern as long as it's for your own use or if you're giving it as a gift -- but it's illegal to sell a quilt with that pattern. I believe the only way you can avoid problems is to change the pattern in some significant way. Certainly you can make a well-known block surrounded by sashings without a problem, but using someone's pattern and selling the quilt can get you in trouble.