What does it mean «Extended license»?
The extended license for logotype is available to use in commercial projects to include the vector images as branding title image (emblem of product).
If somebody will ask you the rights for sales using this graphics (resulted design like emblem, labels, icons, signs), you should show the extended rights for person, interested in your commercial legal use of this design (including this labels, icons, signs).
The rights and conditions of legal use of vector image under extended license your can read in full description.
Another aspects of legal use and rights for commercial use of resulted design elements based on local law of the country chosen for sales of your commercial product.