In a recent news from the development team of WordPress, they said ‘Themes are GPL too‘.
I do not agree with all of that post’s content, as I am still thinking WordPress is similar to clay and a theme is similar to a statue you build using the clay.
but, before I write a detailed post on this, I will just point you to this post below.
Update:
Please read my follow up to this post.





[...] http://wprocks.com/wordpress-news/themes-are-not-gpl-or-is-it/ [...]
[...] Nathan Rice Sadish Bala Joshua Wagner WPDiva Justin Tadlock [...]
hi, how does the licencing go in regards to the header images – for example can i use the header image on a private website?
Thanks
Please read my follow up to this post at http://wprocks.com/wordpress-news/my-wordpress-themes-are-not-gpl-got-my-own-licensing-terms/