Looking for a quick way to find images you haven’t set as being copyrighted? To find all images with an unknown copyright status in Lightroom Classic, click Metadata on the Library filter. Change a column label to Copyright Status. Lightroom will quickly show how many images are copyrighted and how many are not. Click on “unknown” to filter the results.
Want to read more? Check out more in the article, “Find Unknown Copyright Status in Lightroom and Fix it“