I call my license respect.
Ask for permission if you wish to use any original artwork/images in this theme.
If you need assistance to know if an image is of my creation or not, simply ask.
I do not give permission to lift & use the parts of the css layout I created in this theme without permission.
Example: Do not lift the css code of my themes to simply swap images & colors to create another theme.
Use the Firefox default theme as a template and/or remember to always ask any theme creators before using code or images as a template for new themes or works.