If you want to make your code useful and accessible to everyone in the world, choose a specific liberal license that clearly gives people the right to use your work. Organizations with legal departments such as explicit licenses and people want licenses that work in their jurisdiction.
Although Greg mentioned SQLite, he did not indicate that they recognize licenses on their public domain as a public domain problem and how it happens βWork is everywhere for everyone and every use. Public domain actually limits some people, so they also sell licenses. Also, check out The Creative Commons FAQ for CC Licenses has not been transferred to my jurisdiction (country), what can I do to learn more about international license issues.
If this is nothing more than a random solution for you, for example, releasing a huge code base previously owned by Big Company, you might want to get a real IP lawyer, rather than asking a bunch of programmers. :)
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