I am no expert on copyright law. I let one notion guide my actions: stealing is wrong.
I write knitting patterns. Not many, but some. And I sell those patterns. (You can find them on Ravelry.) I would hope that no one would make copies of my patterns without my permission. I would hope that if a knitter is interested in knitting one of my designs then that knitter would be willing to pay a modest fee for the effort I put into the design and pattern.
In the course of my knitting life, I have purchased many patterns. I mentioned one in a recent blog post: the Classic Elite pattern, Ruins of Dunstaburgh Castle vest. A few days later, a friend of mine told me she found the pattern quite interesting but she was having trouble finding a copy to purchase. She asked if I’d be willing to send her a copy.
I responded, “I feel uncomfortable copying the pattern, but I’d be happy to give it to you. I don’t plan to use it again.” So, I sent off the pattern to its new home. I’m thinking that I’ve at least held to the spirit of copyright if not to the letter.