Hiding Directorys for downloads?

[SabbyKat]

i have absolutely no idea if a mod for vbulletin, or something else would be needed for this, so excuse my dumbness :P

i recently setup a method on the site to use points (as users wanted this system for fun), which just involves a bbcode line hiding the content links they want.

now the issue is, once someone 'pays up' they can just copy/paste the download link for others to use for free.

now i know there is ways to 'hide' links by random encryption, but i have 0 idea what i am even looking for at how to do this. i was thinking perhaps vbulletin mod can do it, or even a friendly member could give me a idea what i'm after if not a mod

thanks :P