No, as many users as have purchased can access the links at a time. Its just flash and html, no restrictions on users.
I'm thinking that I want to change the directory name because there will actually be 4 separate links, i.e.
http://www.mysite.org/randomdirectory/link1.html<br>
http://www.mysite.org/randomdirectory/link2.html<br>
http://www.mysite.org/randomdirectory/link3.html<br>
http://www.mysite.org/randomdirectory/link4.html<br>
A buyer could purchase just one, a combination of two or three, or all four at once. Keeping track of 4 different links seems like even more work. Or maybe its not and I'm just imagining all this badly. We don't need real stringent security, it isn't a high stakes selling price.
But out of curiosity, how would one encode an expire time to a file name?