Quad Negative

This didn't fail to amused me. From http://210.8.42.125/other/accagr1.shtml :

  The User will not use, nor will it sell or make available to any person, 
the Information for the purpose of issuing Independent Forecasts or 
Warnings unless:
...
(ii)   the additional forecasting elements are not inconsistent with the 
Bureau's Forecast;

TLDR: Will not ... unless ... not inconsistent