The following icons have copyrights that are not covered by the CellProfiler
license:

microscope-icon_16.png
microscope-icon_32.png
Creative Commons Attribution 3.0
    http://creativecommons.org/licenses/by/3.0/legalcode
    Generously donated by http://onlinepharmacycheck.com/

movie_16.png
Free for use with attribution to:
    http://pixel-mixer.com
    
color.png
Image from the Silk icon theme by Mark James. Free for use with attribution to:
    http://www.famfamfam.com/lab/icons/silk/
    
delete.png
Image from the Icons Land website:  http://www.icons-land.com
    distributed under their demo license agreement.
    
IMG_ANALYZE_16.png
filter.png
Free for use with attribution to Oxygen Team:
    http://www.oxygen-icons.org/
    
illumination_function.png
mask.png
Free for use with attribution to Yusuke Kamiyamane
    http://p.yusukekamiyamane.com/
    
objects.png
GPL licensed: Gnome project
http://www.gnome.org/

IMG_STOP.png
LGPL licensed: David Vignoni 
http://www.icon-king.com/

CollapseTree.png and ExpandTree.png
Covered by the following license: https://wiki.trin.org.au/Mangroves/TermsOfUse
Author: Emma Clifton, https://wiki.trin.org.au/Main/EmmaClifton

welcomescreen_tutorials.png previous.png, next.png
Covered by the following license: http://files.softicons.com/download/system-icons/crystal-project-icons-by-everaldo-coelho/readme.txt
Author:  Everaldo Coelho, http://www.softicons.com/free-icons/system-icons/crystal-project-icons-by-everaldo-coelho/apps-tutorials-icon

welcomescreen_manual.png
Free for use with attribution to Double-J Design, http://www.doublejdesign.co.uk 
    (found at http://www.softicons.com/free-icons/toolbar-icons/ravenna-3d-icons-by-double-j-design/book-icon

welcome_screen_help.png and welcomescreen_forum.png
Free for use with attribution to Aha-Soft
    http://www.softicons.com/free-icons/toolbar-icons/free-3d-glossy-interface-icons-by-aha-soft/help-icon
    http://www.softicons.com/free-icons/web-icons/free-3d-glossy-icons-by-aha-soft/forum-icon