Expiring Links NEEDED

[RC-Central]

I was wondering if someone would be willing to make something like this for vb4.x please. I sell items on my website and I would like to issue a link for the dl once paid for that expires at a perdetermined timeframe (by me). There are a few products out there but I do not have $ for something like this as my site is not bringing in any revenue atm. I do have MS sw that I could offer in trade for the service.

Here is what I am talking about. Take a look at this sw that does what I am asking of.

DLGuard (http://www.dlguard.com/dlginfo/index.php)

Thanks for your time!