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[–] nroslm [S] 0 points 1 points (+1|-0) ago  (edited ago)

It's registering your work with the US Copyright Office. Fstoppers has a good overview of the whole thing: https://fstoppers.com/business/understanding-copyright-both-sides-lens-69975

"Simply knowing you have a copyright is not enough, however. In the event of an infringement, it’s important to have a registered copyright with the U.S. Copyright Office if you want to receive any damages. Most lawyers won't touch a case without a registered copyright. Thankfully, it’s very easy to obtain a registered copyright through online registration."