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gomer - 6:39 pm on Sep 14, 2004 (gmt 0)
Google has the legal responsibility to take action on that DMCA claim. When you have filed the DMCA with Google, they will contact the other website owner. If the other website owner claims that the content belongs to them and not you, Google will have little choice but to leave the page in its cache. If the other website owner does not respond, which I think in the above cases mentionnned, they may not, Google will remove these pages from their cache.
If you have created and own copyright to a page that Google is displaying in its cache but is attributing it to another website, you should file a DMCA with Google.