|photo by Lewis Hine Power (1920)|
Release for lack of release. In any case, if you want to contractually assume liability, you could use a simple indemnity statement like this:
Photographer acknowledges that he has not obtained photo releases from the subjects of his photographs and agrees to indemnify and hold harmless Gallery, its assigns, licensees, and purchasers from all costs and expenses (including attorney fees) in connection with any successful third-party suit or claim arising from or based upon the lack of model releases.If that doesn't work -- for example, because the Gallery wants broader protection -- substitute "photographic content" for "lack of model releases." In that case you will be assuming liability for all content-related claims such as copyright infringement.