hello, can any one explain me this lines how to do that, cause I'm not a drupal coder yet : "I have spoken to bojanz in IRC about this and he recommended that I simply check for this inside hook_form_commerce_cart_add_to_cart_form_alter, look for existing licenses and set it to $form_state['line_item']->commerce_license. Then when it comes time to grant, we simply extend with ->renew()" quote from
drupal.org/node/2193305
