palemoon-dev/platform/layout/reftests/fonts/mplus/mplus-license.txt

M+ FONTS                                Copyright (C) 2002-2009 M+ FONTS PROJECT

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LICENSE_E




These fonts are free softwares.
Unlimited permission is granted to use, copy, and distribute it, with
or without modification, either commercially and noncommercially.
THESE FONTS ARE PROVIDED "AS IS" WITHOUT WARRANTY.


http://mplus-fonts.sourceforge.jp/mplus-outline-fonts/