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  1. I am one of those who “use, reuse, and commingle data”; I’ve been doing it for quite a while. I very well “know the complex issues that arise with even simple additional requirements such as this”.

    But I’ve seen for myself that lack of provenance is the black death of metadata. The problems with CC BY for data are real, but they’re not caused by legal or moral shortcomings, they’re caused by flimsy and cumbersome attribution technology. I think we’ll see the emergence over the next few years the sort of convenient, strong attribution/provenance technology for data that we are starting to see effectively deployed by GitHub for code.

    So think of your metadata as kittens.
    Today our licensing options are:
    CC0: “Free kittens. We don’t care if you let them die.”
    CC BY: “Free kittens. You’d better take care of them.”
    CC0 (+BY): “Free kittens. We’d be sad if you let them die”

  2. Eric, I think your analogy is close, but I feel that it is more like:

    CC BY: ā€œFree kittens. We donā€™t care if you let them die, but please cite our shop where you bought them.ā€

    In other news, at some point in time I saw an add-on document, independent from the license, that covers the BY part. As a scholar, I don’t care, because it is a faux-pas to not cite the origin. However, even academics seem to require reminder of that, and then such a BY clause is useful. Sadly, I can no longer find the text of that add-on šŸ™

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