Gnome Terminal Icon Licence, .xcf [closed]

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http://askubuntu.com – Possible Duplicate: Using humanity system icons for created application I would like to use gnome terminal icon (/usr/share/icons/Humanity/apps/128/utilities-terminal.svg) as a starting point to create new icon for my Ubuntu app. Is this a copyright issue? Can I find .xcf source file for this icon? (HowTos)