I am developing an open source (GPL v3) project to apply KDE's oxygen icons to Windows. I want to know whether I am permitted to incorporate Ubuntu's human icon set (under the Creative Commons Legal Code Attribution-ShareAlike 2.5) into this program without re-licensing the whole program under a different license. If I am permitted, then must I state explicitly that the Human icon set is under a different license?
EDIT: As of now, the source code and icons are embedded into the same executable (the program is in NSIS). However I can alter the program and package the icons separately into some sort of archive and add code to allow the installer to download the icons at runtime