How to prevent the user create multiple trial licensesAnswered

Is there a method(maybe a web API) to prevent the user create multiple trial licenses for the same device? or Do I have to manage it myself via my website during purchasing ?

I already get the point that one license can just be used one time for a specific device with fingerprint tech, but I could not find a solution that the users can create a new license if their trial license are expired.
 

I know that I could check for user`s MAC addresses, email addresses and/or other stuff during purchasing, if the user already downloaded my trial version or not, but I guess I cannot implement it as good as your fingerprint tech.
 

Thanks a lot in advance.