Create immediate evidence of your work
There is a common misconception that registration is required for copyright protection. Not true.
You automatically acquire copyright the moment you create a work. The problem is creating credible evidence that your work existed the moment you created it. FRAPA registration creates that evidence. When a dispute comes before a court, both parties present their evidence. The court must decide which argument is the more credible.
So how do you prove you came up with the format first? The best evidence is a signed declaration by a neutral third-party custodian who swears that they received your manuscript on a certain date and has kept it in seclusion ever since. This is what registration with the FRAPA Format Registry accomplishes.