Download files directly with apache for authenticated users

Here is the deal , I'm selling some files and they can be downloaded.So , only the users that have paid for the files can download them.I want to avoid download via PHP script for many reasons- The files are large ( some are ~5GB)- If the download crush , it must start over again.Is there any way ? Any strategy at all that can help me identify the users that are allowed to download the files , and let apache do the job ( to provide a direct link for download ) instead of using PHP script to stream the file.Any Ideas ?
 
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