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/usr/share/meld/icons/COPYING_CCBYSA3 is in meld 3.14.2-1.

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This work is licenced under the Creative Commons Attribution-Share Alike 3.0
United States License. To view a copy of this licence, visit
http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative
Commons, 171 Second Street, Suite 300, San Francisco, California 94105, USA.

When attributing the artwork, using "GNOME Project" is enough.
Please link to http://www.gnome.org where available.