The new suggestion of the permission rule solve the problem for files that don't get permission due not getting a response of the author of the file !!!
If the Shape is public released in a forum and you have contacted him but no response for 30 days you can use that file in a mod, you MUST credit the person for his work.
So be sure the file has been released in public forum, not sent in private way !
And be sure you have contacted him to ask permission.
If those 2 things are OK you can add the file in the mod and the credits for the file, all files, is a MUST !