SpkPro is another software protection solution provided by GDA Technologies. It is based on parallel port only of your computer. It costs low and very easy to use. SpkPro dongle protection is the best choice for those software sold in low price but large quantity.

Function Introduction
SpkPro offers the following main function:
1.Read/write function
You can make read and write operation for SpkPro.
2.Envelope protection
SpkPro envelope protection can encrypt EXE and DLL. You can also use envelope protection to limit your software's using times and using days.
1. API Call
You can use API Call of our SpkPro to transfer our interfaces if you like.

Compatibility ：
1.SpkPro can protect those software programmed by VC 、 VB 、 VF 、 PB 、 DELPHI 、 C++Builder etc.
2.SpkPro suppports WinXP 、 Win2000 、 Win98 and Win95.