1 January 2014
Χωρισμένα σε κατηγορίες (σε κάποια με υποκατηγορίες):
* Never Published, Never Registered Works
* Works Registered or First Published in the U.S.
* Works First Published Outside the U.S. by Foreign Nationals or U.S. Citizens Living Abroad
* Sound Recordings
* Architectural Works
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Επίσης ενδιαφέρον άρθρο:
How Do You Know The Public Domain Is In Trouble? It Requires A 52-Page Handbook To Determine If Something Is Public Domain

Is it in the Public Domain?
A HANDBOOK FOR EVALUATING THE COPYRIGHT STATUS
OF A WORK CREATED IN THE UNITED STATES
BETWEEN JANUARY 1, 1923 AND DECEMBER 31, 1977
https://www.law.berkeley.edu/files/FINAL_PublicDomain_Handbook_FINAL(1).pdf
May 27, 2014
Menesha A. Mannapperuma,
Brianna L. Schofield, Andrea K. Yankovsky,
Lila Bailey, and Jennifer M. Urban