I think many people are way over thinking this. Sometimes I get really tired of the copyright police.
I lend my magazines, but they are my magazines. My friend makes it from my magazine, gives me back the magazine. I lend it to someone else. Come on guys, we aren't using these to teach a class, sale the quilt. Sometimes it is a common block with a different border or color. I get ideas from other peoples quilt use the same block, which is a common block different color, different border. Also the fabric designer sites have great PDF patterns, even showing what fabrics, that everybody and their brother downloads