<i>If the answer is no, then they cannot do what you said.</i><p>Uh, no. Plenty of companies already censor certain content without accepting liability for parts that they miss. There is no law preventing a company from not hosting content they find problematic, whether it&#x27;s illegal or for any other reason. That doesn&#x27;t give up their protection under DMCA. (CAs wouldn&#x27;t even need DMCA, because they aren&#x27;t hosting content or redistributing it).<p>Similarly, there is no law I know of that would disallow a CA from revoking a cert they issued. Maybe breach of contract, but generally their terms will prohibit illegal activities, so the other side will have breached contract first.