Are there things on or about the average user's computer which can be used to uniquely identify it? (Using PHP, of course!)
I am trying to make a "key" that is based on a user's computer, and which is tied to website/file access so that they can't pirate my content.
For example, let's say user1 pays me $10 for my eBook on PHP.
If there is no password, then that user could circulate it around the Internet, thus "stealing" from me!
If there was a conventional password, then all the user would have to do is distribute the eBook and the password.
But if I could create a "key" that is based on user1's computer, then even if they e-mailed my eBook to 50 friends, the eBook would only open for user1 on user1's computer.
Is what I am describing possible?
I would like to sell content online, but don't know how to prevent people from stealing my content and thus put me out of business?!