Licensing Public Domain Public Use Registration 
Biswajit Sarkar Copyright Blog
JULY 19, 2022
However, authors are not required to make their work accessible to the public. Additionally, creators are not needed to file a copyright registration with the US Copyright Office. It would be preferable to obtain written authorization from the copyright owners before using the original content.
Patently-O
APRIL 6, 2023
In particular, the court first assumed that the work was copyrightable based upon the registration documents. WPL established that an earlier version of the SAS System, “SAS 76,” was in the public domain. WPL demonstrated that the SAS Language should be filtered because it is open and free for public use.
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