I'm a photographer that recently went into a project with a publisher & author. The author hired me to shoot video & photos, some of which would be on a cover. She signed a contract with me & had paid for photos.
Her publisher had contract with her & models (I assume for them to commit & perform their duties).
When time for the handing over of photos for the cover came the publisher was unhappy that I'd only give the one photo per cover and demanded more. I refused and the publisher now is threatening to sue to have the rest of the photos. In my contract with author I state I own exclusive rights to photos, stills & video. I never signed any contract with publisher.
Does the publisher have a case?