This means that all the copies of the book that have been printed so far are infringing the Wikipedia copyright. Fortunately, there's no physical-world equivalent of DMCA that allows Wikipedians to send an infringement notification to bookstores that carry it, requiring them to immediately disable access to the infringing material. But does it entitle Wikipedians (perhaps represented by the Wikimedia Foundation) to a share of Anderson's royalties as damages?