Copyright Clearance or Permission
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Generally, copyright clearance is simple. Items published prior to 1923, anywhere in the world, are in the public domain in the US. Prior to 1993, all copyright clearance actions required mailing a photocopy of the title page and verso (obverse) page of a candidate book to Michael Hart or Greg Newby, but then an online system was developed that accepted scans of those pages. A database maintains records of cleared items, and who submitted them. A few other copyright rules are sometimes applied, for items published after 1923.
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