Anything that is restricted to the bots, not index-able...behind user/pass / paywalls can't be indexed (normally). So if that's the case, I would not worry about optimizing it for Search. It should still be optimized for users through :).

James, You might also want to look at the cached version of your page and then click on Text-only version and see if it shows up correctly. If it does, no need to worry from that perspective, but definitely worth checking from a usability, accessibility etc.