It should be required, by law, to accompany a DMCA claim with some kind of digital signature that can certify the issuer really owns the content (such as a comp

It should be required, by law, to accompany a DMCA claim with some kind of digital signature that can certify the issuer really owns the content (such as a company or law office certificate). Other than that, they're prosecutable as perjury, but in practice, no one ever inquires those cases.