X is Y.

There's a brilliant post here from Raven about what kinds of lies are allowed in advertising:

Those anti-piracy ads in cinemas and sometimes on DVDs — the ones that say "piracy is theft" — are outright lying. Theft has a legal definition, piracy is not it, piracy is copyright violation. This brings to mind a question — if they're allowed to lie about legal terms, would it be okay for them to say, eg. "piracy is premeditated murder" or "piracy is genocidal war-crimes against civilians"? ...

More interestingly, would it be okay for someone to produce and publish advertisements of "copyright-protection is pedophilia", "anti-piracy measures are slavery" and "the RIAA is illegal immigration"?