Copyright Notice Document Licensing Public Domain 
Dear Rich IP Blog
APRIL 16, 2020
Does the absence of the insignia mean that the film is public domain? Nowadays, the publication of a film without copyright notice won't effect ownership, but in 1964, the penalty was draconian. This was the rule until March 1, 1989, when the notice requirement was terminated.
Dear Rich IP Blog
AUGUST 27, 2023
You don't need permission for designs produced before 1928 as they are in the public domain. And you don't need permission if the works were produced between 1963 and March 1989 and they did not include a copyright notice. In summary, you only need to be concerned about 1963 - 1989 designs with copyright notices.
Velocity of Content
DECEMBER 6, 2023
Significant amounts of content are available through licenses, including open licenses such as CC BY and CC BY-NC. Significant amounts of content are also available through the public domain. To what extent are copyrighted works licensed from copyright owners for use as training materials? 529 F.Supp.3d
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