Article 5 6.

The gatekeeper shall not directly or indirectly prevent or restrict business users or end users from raising any issue of non-compliance with the relevant Union or national law by the gatekeeper with any relevant public authority, including national courts, related to any practice of the gatekeeper. This is without prejudice to the right of business users and gatekeepers to lay down in their agreements the terms of use of lawful complaints-handling mechanisms.