Rocket Validator looks for accesibility violations on your pages using the axe-core accessibility engine, hosted on our own servers and integrated into our web crawler. You don't need to buy an additional license, everything's already included in your Pro account at Rocket Validator.
A11Y check: Landmarks must have a unique role or role/label/title (i.e. accessible name) combination
Accessibility rule: This is a new best practice rule ensures that landmarks have a unique role or accessible name (i.e. role, label, title) combination.