I take my knitting everywhere: Ballet practice, the playground, McDonald's (if you are a mom, then you know what I am talking about), the mall, anywhere that I think I can get at least one row done. At times, some kind soul will ask if I sell any of my items. I have always said no because I was never comfortable using someone else's pattern for something that I am selling.
Katharine of Accessories For Your Left Brain has a Lawyer mom and she wrote about this topic this summer. She explains in readable detail that clothing made from a pattern is sellable. Please read her post on this topic if you are curious about it, especially if you want to sell your knitted items.