[Advocacy Advisors] Interesting read - The Valuation of Unprotected Works: A Case Study

[Stéphane Coillet-Matillon]

*tl;dr: *public domain works used as illustrations increase traffic and
would cost about $250 millions a year to the project had they been
copyrighted.

http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2560572
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