license_type
Description:
The license of the program.
The `GtkAboutDialog` will automatically fill out a standard disclaimer and link the user to the appropriate online resource for the license text.
If `GTK_LICENSE_UNKNOWN` is used, the link used will be the same specified in the [property@Gtk.AboutDialog:website] property.
If `GTK_LICENSE_CUSTOM` is used, the current contents of the [property@Gtk.AboutDialog:license] property are used.
For any other [enum@Gtk.License] value, the contents of the [property@Gtk.AboutDialog:license] property are also set by this property as a side effect.