A simple trademark license agreement is enforceable, whether it’s oral or in writing. However, having a downloaded, printable PDF document will make it much easier during litigation to enforce all aspects of the agreement. It is highly recommended that you have a standard trademark license agreement in written form, signed by all involved parties. You can find a simple checklist or an example online that includes all the sections you want in your agreement. You can then make a copy, or you can create your own.