I’m new to WordPress and I have a question about license.
Can I use a GPL 2 Theme (downloaded from http://wordpress.org/extend/themes/) as a framework for Commercial Theme?
I searched and I found that Yes as long I keep the same License, but what are the changes I can make?
Can I modify the Author…. Name … from style.css?
What are the credits I have to add?
Short answer:
You may change everything as long as you keep the same license.
No credit is actually required.
But it is polite. I would add it in the stylesheet under the notes section with a link back to the original.
Provide the original author and link to the source.
Something like “Based on the original work of John Doe: http://www.johndoe.com/myawesomecode“