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While few sources focus entirely on copyright law, you may find coverage of copyright law issues in some of the journals, newsletters and blogs that address IP law generally. With that in mind, here are a few resources to explore.
Journal of the Copyright Society of the USA. Coverage: HeinOnline — 3 year lag but full coverage back to 1953; Westlaw — coverage starts in 1990; and Lexis — coverage begins in 2010.
Law360 (Login to your Lexis account > click the menu in the upper left corner > select Law360 > once on Law360, you can choose the Intellectual Property section > from that page, you can review stories and signup for the daily newsletter)