A horrible discovery brought on by the Anthropic suit: Publishers don’t always register for copyright (!)

To be eligible for the Anthropic class-action suit, authors’ works must be registered with the US Copyright Office. But some authors are finding their publishers did not in fact register their books as they are contractually obligated to do.

So now what? First, confirm whether your works are registered. You can ask your publisher or agent for the copyright certification, and/or you can use the US Copyright Office online search to see if your work has been registered. The Authors Guild is assisting authors who have learned their publisher(s) failed to register works; if you have an agent, you should be discussing the issue with them as well.