serving purchased files

[eluser]slowgary[/eluser]
You could have the downloader_script.php increment a counter after it serves a file. It wouldn't be perfect, as it would still increment even if the user hit 'cancel' at the download prompt. If you're already using an expiration date then the number of times they download is moot.

To hinder users from sharing their accounts you could provide personal information immediately after logging in.