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Site management meta tags are used mostly by the people working on the website. While they may be interesting for your customers, they are typically more important for you and anyone editing your pages.
Who wrote this Web page? You can include a list of authors if multiple people wrote the content and it typically refers to the content authors rather than the designers of the HTML or CSS.
Set the copyright date on the document. Note, you shouldn't use this instead of a copyright notice that is visible on the Web page, but it's a good place to store the copyright in the code as well.