I added a place in the code page to show the license for your code.
All existing code license are set to "All rights reserved" by default, because I think not mentioning about the license means "All rights reserved".
Of course you're free to change it.
The license for your future code is set to "MIT License" by default, because I think the majority of wonderfl community believes in open source.
Change it from your account page.
For further information, see: About license
I'm not a license professional, if you have any suggestions, please contact me.
