The license of the program, as free-form text.
This string is displayed in a text view in a secondary dialog, therefore it is fine to use a long multi-paragraph text. Note that the text is only wrapped in the text view if the "wrap-license" property is set to TRUE; otherwise the text itself must contain the intended linebreaks.
When setting this property to a non-NULL value, the gtk.about_dialog.AboutDialog.license property is set to gtk.types.License.Custom as a side effect.
The text may contain links in this format <http://www.some.place/> and email references in the form <mail-to@some.body>, and these will be converted into clickable links.
Builder instance for fluent chaining
Set license property.