Contracts are part of the business. There are several things you need to consider before you sign a contract.
What do they mean when they talk about Rights?
Many magazines who published craft projects contract the projects with a First Rights agreement. This means that the publisher has the right to publish the design with instructions for the first time, and then the copyright of the project reverts back to the creator or designer. Other times, the publisher gets an All Rights contract meaning it owns that project in many forms which can include creating kits or publishing the project digitally. Either agreement means you need to contact the publisher to inquire if you are allowed to make and sell the design. Manufacturers usually want All Rights so that they fully own a design that allows them to use the design for many purposes including adverting, blog image, and project sheets for retailers.
Read the ful article on Creative Income Blog!