Can't prevent Preview from permitting copying content with Adobe Acrobat document security
Preview on macOS, like many PDF readers, don't care about these kinds of obscure restrictions on what you can and can't do with PDFs. If you're displaying content to the user, they can copy it, it's as simple as that.

Password protecting the entire file encrypts its contents, and password protecting printing can be followed by PDF readers including Preview, but apart from that all the other restriction types are worthless outside of Adobe Reader.