I have been using the Twenty-Ten theme to create child themes for my wordpress sites. I have essentially taken the TwentyTen theme, changed all the things that I generally adjust for a site and made my own template theme essentially.
My question is, am I in violation of any licensing or anything by completely customizing the theme. I change the theme name on the style.css file and remove the parent theme links so it doesn't get affected by updates.
Can I do a Find and Replace to change all references to Twenty Ten and still be ok with the GPL license?