Question

I’m searching for a way to generate a (limited time license) .so
when a user starts the program . it has to check license date first before the program runs.

but the problem is :
i tried a couple of solutions . one of them is python’s time.ctime , (to check time and see if it’s realy during the license time) and it returns the time of the machine, so whenever a user want to use software without license he’ll just change time of the machine.

i hope the idea is clear enough

any better ideas?

please inform me if you want more explanation

Answer 1

Regardless with the question whether or not this hassle is really worth the effort, you can check access times of ubiquitous files (e.g. /etc/passwd in Linux) and compare these to the current date. If you see that the files have been accessed/modified in the future, you know that there is a problem. Again, at least in *nix, a user may substitute system’s stat, so that it “massages” the info you are looking at.