4.1 You may modify the source code of the product at your own risk, edit it and adapt it to your needs both graphically and functionally.
4.2 Copyright notices, serial numbers and other features of the product used for software and source code identification, in particular the visible copyright notices and the link contained therein, may under no circumstances be removed or changed. The same applies to suppression or obliteration.
4.3 Anything else applies only if you obtain from the manufacturer an additional license, by which you are entitled to remove only the visible copyright notice (Branding Free license). This license is not offered for every product.