Which open source license?

[gonzalez]

Hi!

I've created a filter builder control, and I'm planing to create some diagram drawing control built the top of GWT. I would like to upload the code onto code.google.com. Which open source license is recommended? Is there a restriction by ExtJS?

In my code, I would like to extend classes from the GXT lib.

Regards,
Gonzalez

[abe.elias]

Sounds like a great UX.

If your extension requires GXT but does not use any code from library, you are able to release your extension under a liberal license (free for commercial usage) using our FLOSS exception.

http://www.extjs.com/products/ux-exception.php

[gonzalez]

I'm only extending classes, but I don't modify the GXT library classes.
I'm thinking to have my code under GPL v3.

What is the normal license information I have to put into the header of each file?

Regards,
Zoltan Bekesi
gonzalez