[thelist] PHP Based file download system.

[Tanner Burson]

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I have been charged with designing and implementing a large web based 
file download system.  It needs to restrict users from downloading a 
file more than once and track some basic usage stats.  This part is easy 
and I can easily handle.

My problem is dealing with incomplete downloads.  If a user is only 
allowed to download a file once, how do I track a completed download?  
Should I just go with a timestamp based system where a user has X amount 
of time to get the file?  Any help would be much appreciated.