Copy protect SD Card

Application to read serial number on SD cards. I have an application in VB6 that needs to read the serial number on an SD card. If no one can do it using VB6, I will consider development in another language. I need a function that I can call from my VB6 code to find the serial number on a SD card. From what I know, all SD cards have a unique serial number, created by the manufacturer, that cannot be changed. If you think that you can do this, you can write a small application in any language which finds the SD serial number. Compile that application to .EXE and upload it. I will test it. If you are accepted, you will create a DLL (or similar component) so that my VB6 application can call your function to find the SD serial number. Or, you can provide VB6 code that doesn't need a DLL.