I'm curious why you decided not to use Aloha Editor, since it is also able to produce clean markup. Disclosure: I'm one of the Aloha Editor developers.
http://cdn.aloha-editor.org/latest/lib/aloha.js 1.1MB!
http://imperavi.com/js/redactor/redactor.js 168KB (odd, it is an encrypted version)
The actual minified 8.1.0 version that you get after giving them a fake email address is 41KB.
I expect the size would be around 300KB if only the basic plugins are included.
Still, it's a lot bigger than redactor - point taken.
Just curious. Thanks for providing a great tool to the community!
Drupal is interested in integrating Aloha, and we are currently discussing several improvements that would be necessary for them. Have a look at the issue tracker. I think the UI À la carte and accessibility will be the next big user-visible developments.
Now, with the GPLv2, it is possible to use Aloha freely in most websites/webapps. You don't distribute your website/webapp and therefore are not bound by the GPLv2 to divulge your website's source code.
The GPLv2 _would_ take effect if you distribute your website in the traditional sense - a package that someone can run himself.
(IANAL and can't speak for Gentics etc.)