The Branding Removal license lets you remove the "activeCollab Powered" graphic and any mention of the activeCollab name in pages that your customers can see (this applies to all pages except Administration section). It's great when you want to use activeCollab, but don't want your customers to know which system you are using to power your extranet.
This license is perpetual (it does not expire) and you can purchase it separately for each activeCollab installation that you want to remove the "activeCollab Powered" graphic from.
The important thing to note is that Branding Removal license is not White Label license.
The Branding Removal license is just a license to remove "activeCollab Powered" graphic from the footer of pages that your clients can see and nothing more. All the other conditions from the activeCollab License Agreement still apply, meaning:
Simply put, Branding Removal gives you license to remove the "activeCollab Powered" graphic from the footer, but it does not give you license to re-brand the system and sell it as your own product.
You can offer activeCollab to your customers, but you can charge for value added services only (installation, customization, localization, maintenance, training etc.), not for the software. Your customers need to be aware that they are using activeCollab and that they are paying you for value added services.