Copyright Notice Document 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
SEPTEMBER 16, 2020
My understanding is that all publicity photos taken back in the 1920s and 1930s were never copyrighted, therefore, in the public domain, especially if the photographer is unidentified. We contacted the USPTO for guidance as to why the FOA was reversed but the examining attorney directed us back to the documentation.
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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 also available through the public domain. It is important to understand the role of word embeddings when it comes to copyright because the embeddings are the representations (or encodings) of entire sentences, paragraphs, and even documents, in a high-dimensional vector space.
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