The truth of the matter in copyright is that it cannot be copyrighted IF the person is using something that is considered public domain. For example, squares, triangles, horses, dinosaurs, flowers and so on.
Even flour, sugar, etc. The only thing in that can be copyrighted in a recipe are the directions. The name such as Betty Crocker is a Brand Name and is protected under a different set of laws. However, I can write that same recipe stating 1 cup flour; 1/2 cup onions, etc. and rewrite the directions completely and it then becomes legal to publish this recipe even tho' it makes the exact same product with the exact same taste/texture.
This also applys to sewing patterns. 18-inch doll for example from Simplicity and McCall's. The patterns are exactly the same for cutting out a pair of slacks because the are for the same doll and no matter how you draw it, it comes out the same. When these companies list it as copyrighted they know the pattern itself is not what is under that copyright but it Is the WORDING in the directions.
It's the same with fabric. How many roses or daffodils or palm trees can you make? Each one is still a rose or daffodil or palm tree. You can fold them or cut them on a curve or stand them up straight but again they are still what they are in nature. This is why the USA has refused to allow the copyright such things.
I have taken several creative writing classes and this is the first discussion in every class. "Copyright will be honored. If not you get an F for you grade snd that F stands for FOOL if you think I (instructor) is not going to know you are infringing on a copyright." NOT quoted exactly as one of my instructors also quilts and is a member of this board.
Hope this helps. Clear as Mud--maybe.