Custom licensing is a toolkit add-on feature and requires that a license be added into the Runtime Manager (RTM).
Follow the normal instructions for toolkit add-ons
Once added, the license string appears in this format in the About VBVoice Toolkit Licenses dialog:
CustomLics=PNX-xxxx-xxxx
Where:
PNX: Prefix distinguishing your licenses in RTM from other custom licenses
xxxx-xxxx: The key