> > On Jan 12, 2015, at 6:42 PM, João Varela <joaocvar...@gmail.com> wrote: > > Hi > > I rolled out my own license scheme so that I don’t have to pay anyone. ;) I > find that coding license checking methods with Cocoa and Objective-C is > terribly unsafe. Objective-C has the nasty habit of exposing classes and > their methods, which you can easily access/find out if you know what you are > doing (otool and class-dump for starters). I do all my license checking code > in C++ or just plain C, and use redundant checking in different places. > Another trick I learned in a conference is to use critical variables as > static variables rather than class ivars. However, my needs are probably > different than yours, but all I’m saying be careful how you expose your > licensing code if you are going to use objective C. > > Please read this: > > http://loadcode.blogspot.pt/2006/02/cracking-software-on-os-x.html > > and this: > > http://lifehacker.com/5736101/how-to-crack-just-about-any-mac-app-and-how-to-prevent-it > > <http://lifehacker.com/5736101/how-to-crack-just-about-any-mac-app-and-how-to-prevent-it> I used to worry about stuff like that, and spent a whole bunch of time trying to obfuscate all the licensing code. Now I just put it in plain C/Obj-C functions, because:
1. The assembly is always there. No matter how many precautions you take, it’s always going to be possible to crack your code. It’s just a matter of how much time one chooses to spend cracking it. 2. There’s *always* going to be at least one guy who’s willing to spend enough time to crack it. 3. That one guy will post his crack on a torrent somewhere, and then everyone else will have access to it regardless of their skill level. Basically, it’s a waste of time. If people want a cracked version of their app, they’ll get a cracked version of your app. Fretting about things like this is just a time sink without much benefit. Charles _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
