CamModelProtection is currently having a sell to celebrate their second anniversary. Kind of what got my brain jogging with this to begin with. Outside of that, I've known of the networks listed above offering in-house protection.
DMCA512 is another service to consider. I can tell you they're more responsive than CamModelProtection and I've personally seen their crawlers / algos working. Very impressive. It's who C4S is using. Tried getting CamModelProtection responsive on Skype and email to discuss bulk rates, studio pricing, ect. Not very responsive.
Cool thing about using a 3rd party service is a lot of them offer active monitoring. DMCA512, for example, will crawl the tube sites, crawl the torrent sites, has algos to detect language variations, ect. Also, they'll protect all your content. A lot of in-house services will only submit takedown notices for the content that was pirated off their site specifically. A lot of them will only submit requests on behalf of the models and doesn't do much, if any actual monitoring themselves.
Additionally (and at no cost) it's possible for a model to give someone else the right to submit DMCA takedown requests on behalf of a model. This way the model's own name and information doesn't have to be on the letter. One huge can-of-worms when it comes to camgirls / producers submitting their own requests.
There might be some sites that do that, and if so, I'd be curious to know who.
I've had a model submit a CB review to me where she highlights that CB offers DMCA takedowns, but doing some Googling, there's some angry tweets and whatnot claiming just the opposite.
@punker barbie can you spread some insight into this? Honestly don't want to holler at CB support, can though.
If someone would be willing to share the networks listed in the models only section, that would be awesome. If not, I guess I get my second list going.