Software protection from pirates

[Onceler]

I am using Code::Blocks with wxWidgets and need to know if there is source code for it that when implemented will work on Windows, OSX, and Linux.
Or if not could someone help me make some code.
I want it timed so that when a person has reached 15 days the software won't work any more. I also want it timed so that it expires in a year from purchase.
I also need a way to generate keys for those who buy them and a list of keys to exclude (because of piracy or other reasons).
Does anyone know some tutorials or books on this subject?
If it will compile on code blocks it will work for any of them.
Old compromised code is fine I just want to learn from it.
Thanks

 

[Modelworks]

A good place to read about protecting code or understanding how it works is the RCE forums. You can read about what works, what failed and why it failed.
http://www.woodmann.com/forum/index.php

 

[Borealis7]

in Linux, you can use ELF32 to physically insert the DateTime of the first run into the executable code! but that's not a feasible solution and wont work anywhere else other than Linux...