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LOCKSS is short for: Lots of copies keeps stuff safe.

This is for digital material where perpetual usage rights have been granted, but the original source might not be available. It’s also used to make sure that journal content from countries that censor remains available.

This all is mainly for libraries and their online collections.

It looks like the core value prop is that it will publish documents which, for one reason or another, stop being available from the original source.

And that relates to whole journals, not single papers, apparently.

https://clockss.org/triggered-content/

See https://clockss.org/about/how-clockss-works/ for an overview of the implementation.