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As long as you could prove that you're not breaking the law (using legal definitions, not your own) and that you have permission to use that content - I don't see why not. If you buy the expired domain and restore it, that can work very well from an SEO POV - however there may be legal ramifications and the original owner may be able to come in later and remove your site or take it over From an SEO POV I have seen this tactic work when re-buying the expired domain and restoring it. I can imagine, however - that the main issues would be legal challenges