Security issue with download link to file

Hello, we considered buying the premium?plugin and think it’s very good, except for one thing that unfortunately makes it unusable for us:

If you receive a download after registering a serial code, the download address for the file is always the same and can be accessed as often as you like. (In Chrome, for example, a PDF file does not download, but is displayed directly in the browser, where you can copy the URL above.) This means that once you enter a serial number, you can simply copy the link to the file and then distribute it anywhere on the Internet. We have to protect our files somehow and that doesn’t work if the download link is freely available. This makes the entire (and really good) function with the serial numbers useless.

Is there a way in the plugin to instead generate a one-time link to the downloadfile that can only be accessed once and then becomes invalid?