In the case of copyright, think of it as anti-current-implementation of copyright rather than anti-copyright. For example, you could oppose the current copyright term, but that doesn't mean you are anti-copyright. Quite the opposite, in fact.
That's the charitable coloring. Owning concepts or ideas, and trying to police others' use of ideas you """own""" is absurd.
(Not so ironclad that you're wrong not to use it, but I'm a fan of this term, so promulgating)