Not any more. It used to be true in the US that the copyright declaration has to include the claimant and the year, and that not inducing one or both forfeited

Not any more. It used to be true in the US that the copyright declaration has to include the claimant and the year, and that not inducing one or both forfeited your copyright. This hasn't been true for decades and since then copyright is automatic and implicit. Now it's basically just a textual version of Big Brother eyes warning you that someone cares about this thing and reminding you that copyright still exists before your Ctrl-C into your own website.