eDownload Protector Script?

[jdk]

I am looking for a script (free or paid) that I can set up to sell digital products. I am not looking for a cart system, rather something I can configure for different files that will allow links to expire after a certain amount of time after a purchase, allow a given # of download per link, works with paypal.

Any suggestions?

 

[weblord]

paydotcom.com works with paypal it's a whole solution
also clickbank.com changes the download url every transaction.