RE: Enforcing trial software on Mac
RE: Enforcing trial software on Mac
- Subject: RE: Enforcing trial software on Mac
- From: "Jeff Laing" <email@hidden>
- Date: Mon, 16 Mar 2009 20:46:47 -0600
- Thread-topic: Enforcing trial software on Mac
> I have seen a couple of fairly nice solutions, and lots of really
> awful ones. Generally speaking, the awful ones try to go to great
> lengths to be sneaky and hide files or other data in places in your
> computer they shouldn't be messing with.
Its worth pointing out that most hacker-types know about 'fs_usage' -
there's little "hiding" that your app can do without being seen by those
who want to know.
http://developer.apple.com/DOCUMENTATION/Darwin/Reference/ManPages/man1/
fs_usage.1.html
Just make the uninstallation process cumbersome enough that people will
want to buy your product rather than uninstall/reinstall once a month.
Use a real installer, not just drag+drop, so that your install process
can write the expiry info into a file that's checksummed/signed however
strongly you like. Then, if that file goes missing (say, someone writes
a cron-job that runs once a day to remove your file), require a
re-install rather than just recreating it.
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