Q: “Is permission needed from a publisher to develop resource materials for a textbook if those materials will be sold commercially or is it just necessary to have a disclaimer?”

A: Elsa Peterson, a freelance editor with 25 years of experience in the college textbook industry:

“I’ve done a fair amount of permissions editing over the years, which doesn’t equip me to give a comprehensive answer to your question, but I’ll give you my perspective. I think there are a couple of different points to address here.