Dude hiding this information is just silly. Just the same as when companies decide to keep security flaws a secret in the hopes that nobody will figure out how to exploit their system.
Let's be realistic here, people who do not have unbranded licenses could still come and ask for the information and you would give them just the same thus defeating your entire plan.
The second thing is that Blesta has a rock solid activation and licensing system that isn't leaked/cracked/nulled by those others who outsource to Hyderabad so the only people who can use Blesta beyond the trial are legitimate customers.
The third thing is that 90% of people who buy the branded edition and wish to unbrand it already know how to do so, the other 10% will get the answer from you, lol.
Just my opinion, nothing personal. I initially removed the branding from my system but the thing is that the branding is actually better from a business standpoint because it inspires confidence in your customers when they know that your billing system is one that is secure, reliable, and built by a reputable company. I can understand why some others may want to hide their branding, personally when I go to buy hosting and I see the host is using whmcs and immediately I know that if they don't have an external payment processor I'm sure as hell never storing my credit card on that, lol. With Blesta it's the opposite feeling, the branding inspires confidence and also let's your customers know that their account information is secure.