Social DRM and Watermarking

Just heard a reference to "social DRM" (Digital Rights Management) and wondered what it was. Turns out its a new word for watermarking (either visible, invisible or both) as described in the aptly-named article "What the Heck is 'Social??DRM'?" by Dennis D. McDonald:

http://www.ddmcd.com/managing-technology/what-the-heck-is-social-drm.html

When I was reading through www.tinaja.com back in '98 or so, pondering the art and science of PDFs as e-books, I was thinking through the very same things. I wonder what the next year or two will bring...

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