The scam works a little like this:
A photographer posts their work online under an outdated Creative Commons license, such as version 2.0, that does not give licensees the right to fix license problems within 30 days of notice, as do the current CC 4.0 licenses.
The photographers lurk until someone unwittingly posts the photograph online without proper attribution.
Then, they sue. And they sue. And they sue.
This is the topic of my most recent legal research paper, “Rise of the Copyleft Trolls: When Photographers Sue After Creative Commons Licenses Go Awry.” …
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