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I'm looking for a software that will allow me to distribute files on a USB stick (or CD/DVD also a possibility) that will lock the information after a determinated number of days.

It would be nice if it also prevented the copy of the files.

The solution doesn't have to be perfect, just functional enough that will deter most people.

  • Ideas: encrypted USB drive with a password that only work for X amount of days.
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What operating system are you using? –  Taegost Jul 30 '13 at 17:20
    
You cannot prevent a file from being copied if the user has root permissions on the system the files are being read on. Sounds like you should use online distrubution if you want to limit the ttmeframe the files can be downloaded. Even then they can simply copy the files they download because they have root. –  Ramhound Jul 30 '13 at 17:22
    
mostly windows, I agree that they'll be able to copy the files, but is there something that at least blocks/erases the original content? –  david Jul 30 '13 at 19:58

2 Answers 2

Require online access, check against a server that looks up the key that's on the drive and disallows it after the trial period is up. If the server says it's still valid you decrypt the file and render it to a canvas internally so what is displayed to the user can't be cut & pasted. They could still take screenshots, though.

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Try using GPG to encrypt the files, with a time-limited key. The encrypted files can be copied, but they're essentially useless without the key. After the provided key expires, the recipient can't open the files any more.

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