They recognize that the public domain might not exist in all legal domains, so a licensed version is available, for a fee.
Others have decided to decline to use copyright protection. There's a list of such software at http://unlicense.org/ .
I wouldn't look to the Berne treaty for some statement of the international existence of copyright law. You need to look towards national laws instead. For example, the US recognizes the public domain, and a work of the United States government is automatically in the public domain in the US. (Though it might not be in the public domain elsewhere.)
So like any social movement, if enough people release software and disclaim copyright protection, then those jurisdictions which don't recognize the public domain might change. If no software ever takes the risk, then it will never change.
http://www.sqlite.org/copyright.html
They recognize that the public domain might not exist in all legal domains, so a licensed version is available, for a fee.
Others have decided to decline to use copyright protection. There's a list of such software at http://unlicense.org/ .
I wouldn't look to the Berne treaty for some statement of the international existence of copyright law. You need to look towards national laws instead. For example, the US recognizes the public domain, and a work of the United States government is automatically in the public domain in the US. (Though it might not be in the public domain elsewhere.)
So like any social movement, if enough people release software and disclaim copyright protection, then those jurisdictions which don't recognize the public domain might change. If no software ever takes the risk, then it will never change.