It has been said that machine code is so unreadable that the United States Copyright Office cannot even identify whether a particular encoded program is an original work of authorship.
Prisoners of the Lost Universe is registered as copyright to Samuel Goldwyn Company in the United States Copyright Office database.
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Barbara Ringer (1925–2009) was the first female Register of Copyrights in the United States Copyright Office, an important contributor to United States copyright law in the 20th century, and a key force behind the preparation and passage of the 1976 Copyright Act.
However, nineteen of her vocal, instrumental and operatic works are registered with the Library of Congress through the United States Copyright Office.