You may edit my themes in any way. You may use parts of my themes in a personal theme for yourself, as long as I'm directly credited. You may move the credit link to another part of the blog, as long as it isn't difficult to find. You are absolutely not to take one of my themes, change the credit to your own username, and give it out as if it's your own. Editing a theme, light or heavy, does not mean it belongs to you.