cc0

Promoting the Public Domain with Creative Commons' CC0 Initiative

It used to be that you could safely assume a work was public domain unless there was a highly visible warning printed on it, containing both the copyright owner and the date of copyright (at least in the USA). This system also ensured that, when the work's copyright expired, you could tell from any copy that this was so—by simply adding the duration of copyright to the date printed in the work's copyright notice. The Berne Convention, however, changed all that by replacing the assumption of freedom with the assumption of monopoly, and it now takes extensive research to be sure a work is public domain.

The Creative Commons' new CC-Zero initiative, instigated largely as an adjunct to the Science Commons' "Protocol for Implementing Open Access Data" is designed to make things easier.

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