lee;As no one has yet tried to answer your question I'll try to give you a few general pointers.
First of all, everything I say is questionable because I do not have any experience with reBranding.
As stated in previous posts, the code you are trying to use
[={WhatEver}] would normally require the information to exist prior to being compiled. ( It must be an existing Activ Variable ) Then for the code to be displayed, the page containing the code must be enabled for "PreProcessing". Activ E-Book will replace your code [={WhatEver}] with the actual value when the program is compiled.
Under "Variables & Scripts" in the Activ E-Book help section, a topic about "reBranding" explains that for "reBranding" to work you will need to supply your customer with a small "reBranding" program. From this information I understand that this "reBranding" program has the ability to alter the "reBranding" fields you pre-authorize. The help section also explains how you create the "reBranding" program that you give to your customers.
The "help" information concerning reBranding is quite detailed.
Ron