Whois Privacy is and always has been a joke in this respect. GoDaddy/eNom/Moniker/etc. will ALL roll over and give up your info on a privacy "protected" domain with little more than an email. Sad but true FACT.
Realistically, a Registrant should not reasonably expect the Registrar to put themselves in any sort of "middleman" position or set themselves up to be party to a lawsuit. This is why, if you do bother to read the "T&C's" of any of these registrars you will see the same weak protection that is really being offered - they can and WILL give you up.
Is this right? Probably depends on which side of the fence you happen to be sitting on...
Registrants seem to universally think that it will take an order from the court to break the Privacy shield, and perhaps that SHOULD be the case but, sadly, in practice it is not.
GoDaddy will even charge you for this as well! Yes, after you pay extra for protection, they charge you more when they fail to protect you... nice, huh?
BB - I get why you're cranked over this, and rightfully so. But the bottom line is that you need to deal with whomever this wanker is claiming copyright and be done with it.
From Moniker's own T&C's, they should have already forwarded you everything that the complainant sent them. If they have not, then they really suck for not following their own stated protocols. If they have - Deal with it already.
Bari - You might want to rethink the cheerleader enthusiasm making blanket statements about "NEVER", "BEST IN THE INDUSTRY", ETC., especially when you've made it clear in this thread that you really do not know what/when/where will/can happen in situations like this (since you do not work in Legal). From all I've seen over time, you have intervened many, many times for members here to resolve problems and have earned respect for that but, seriously, there are other Registrars with just as strong - if not better in some respects - security as you have. That's why the definitive statements are beginning to work against you. And, yeah, being hot doesn't hurt. (Hey, I did have to reference that... haha).
I don't use Privacy Protect for a variety of reasons as well as the reality that has been illustrated by this instance. That, and everything else in this post, is just my take on it. Your mileage may vary.