| http://www.w3.org/ns/prov#value | - Check the Wayback Machine or other archive. - Pull together any documents supporting your claim to the content - publication in written form with the author's byline, copyright documents, letters of transmittal from a content author, etc. - In the U.S., one free or inexpensive method for dating documents is using a notary public (found in most banks and other locations).
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