GNU Art - Digital Restrictions Management
This wonderful image about the dangers of Digital Restrictions Management comes from Chris Hayes, aka cbhworld.
As well as the PNG version, Chris also makes the Inkscape SVG sources available, plus an amusing alternative to the GNU Head., of Stuart Langridge, free software developer and host of the GNU/Linux radio show, Lugradio.
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All these images are licensed under the Creative Commons Attribution-ShareAlike license.