First of all, please visit Virtual Serial Port Driver purchase page to read the descriptions of available license types: /purchase/vspdxp/
If you want to develop the software using VSP AX, you have to purchase OEM License or Source Code License or Full Source Code License.
The OEM License entitles you to the unlimited redistribution of our software as a part of yours (commercial software included): /wiki/software-licenses/oem-eula.html