VSP AX Licensing
First of all, please visit Virtual Serial Port ActiveX Control purchase page to read the descriptions of available license types: http://www.eltima.com/purchase/vspax/
As can be derived from there "Single User License: To install third-party software with incorporated VSP AX Control at several computers the Licensee must purchase Single User Licenses according to the number of computers he wants to install it to." This means that you need this type of license if you want to use the software which has our ActiveX incorporated on a different machine than the software with ActiveX was developed on.
If you want to develop the software using or VSP AX incorporated you have to purchase either Single Developer license or OEM license. If you order Single Developer License you have a right to use VSP AX when developing your own software. Note, that to test your software (with our ActiveX built-in) on another PC you need to own a Single User License. To read more about Single Developer License for VSP AX, please, follow the link: http://wiki.eltima.com/software-licenses/single-developer-eula-virtual-serial-port-activex.html
The OEM License entitles you to unlimited redistribution of our software as a part of yours (commercial software included): http://wiki.eltima.com/software-licenses/oem-eula.html