A pattern is only copyright if the owner, designer, developer, etc., filed for a copyright, paid the fees and most likely hired an attorney to navigate through the system. Most patterns are not copyright, it is an expensive and lengthy process. Patterns that are copyright will state it on the patterns with the date it was copyrighted as well as some wording like all rights reserved. Other patterns that are not copyright may have some wording stating for personal use only, cannot be copied or distributed without permission from the designer.