While I don't typically read End User License Agreements, I was pointed to the following phrase that exists in the End User License Agreement for Palo Alto Networks equipment:
1.3 License Restrictions: End user shall maintain Products in strict confidence and shall not: [...] (d) disclose, publish or otherwise make publicly available any benchmark, performance or comparison tests that End User runs (or has run on its behalf by a third party) on the Products;
I trust you can think through the implications of this restriction on your own. It certainly adds additional color to the recent public spat between NSS and Palo Alto Networks.