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Every volume in AI the Classics is free to read, copy, quote, translate, adapt, and republish, including commercially, under the Creative Commons Attribution 4.0 International licence (CC BY 4.0).

Our sources are in the public domain. Our editions, the translations, prefaces, translators' notes, glossaries, and their arrangement, are released under CC BY 4.0 to the extent that copyright or related rights subsist in them. Rather than asking readers to work out which portions are protected in which country, we ask one simple thing of every reuse: carry the credit and the link.