I bought an embroidery pattern (in another state) that I fell in love with - bought it because of the picture of the finished product, didn't realize it was embroidery until after I got it home and looked more closely at it. After a while, I figured out a way to adapt it to a quilt pattern, Wrote to the pattern designer, and asked for permission to convert it to a quilt pattern, and she agreed, said to give her credit as the designer, which I fully intend to do. I can follow a pattern, but my hat is off to someone who can think up an original design, so I do feel that she deserves to be paid for her work, and receive the credit as the designer.
However, I feel that since the magazine printed multiple copies of the magazine, they have to expect that there WILL be quilts made from these patterns. If I have paid for the magazine, I have paid for that pattern, and can use it to make as many quilts as I choose from that pattern. If I change colorways, or one small design segment, then it is ADAPTED from that pattern, not the exact one shown. However, I would still give credit to the "author" by putting that information on the label, as much as possible. Or say something like "My version of Pattern ABC, from (Quilt Name) Magazine.