The license of the program.
The gtk.about_dialog.AboutDialog will automatically fill out a standard disclaimer and link the user to the appropriate online resource for the license text.
If gtk.types.License.Unknown is used, the link used will be the same specified in the gtk.about_dialog.AboutDialog.website property.
If gtk.types.License.Custom is used, the current contents of the gtk.about_dialog.AboutDialog.license property are used.
For any other gtk.types.License value, the contents of the gtk.about_dialog.AboutDialog.license property are also set by this property as a side effect.
Set licenseType property.