Once you have published something and includes "This is placed in the Public Domain" or Released CC0, then it's gone. Just as much as if you are dead 100 years and the max term is 90.
You can only get back rights you assigned to someone else (difficulty varies). You can't get back Public Domain (or CC0 which is just the same thing).
Quote:
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Lawrence Lessig and Eric Eldred designed the Creative Commons License (CCL) in 2001 because they saw a need for a license between the existing modes of copyright and public domain status.
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Just yet another template giving up rights under Copyright
BSD Free Licences from 1988. FreeBSD is the OS. BSD Free is licence.
GPL started with Richard Stallman in 1989. Now at version 3
Apache Software Foundation Apachce Licence 1995 (based on BSD)
CCL original version 2002
Richard Stallman & Lawrence Lessig have very political agendas. It's not just about reforming copyright or freedom.
One aim of some is to abolish all copyright, patents. trademarks, registered designs, basically destroy the concept of Intellectual property.
Certainly Copyright need reformed. It needs to go back to life +50. The exceptions for derivative, satire, reviews, education, copying extracts need to be clearly defined by international treaty and not by Disney.
Patents even more need reformed, especially the USPTO, where the default is to issue and have competing prior art or invalid decided in USA courts (which vary by State!).
Simply propaganda of CC isn't the solution. If you are a creator, then © date <your name, can be pen name> all rights reserved. You can relax the rights later or give to Public domain, what's relaxed or given away as Public Domain can't be recovered. Only transferred rights can be recovered (like to a Publisher for a term).