How to protect/license a static library? Multiple instances?

[Keith Thompson]

If you don't trust your customers, maybe you shouldn't sell to them,
or maybe you should find another method of billing, such as a
one-time-fee, which is harder to cheat on.

[...]

I suggest that this entire discussion is completely off-topic for
comp.lang.c. There's a misc.int-property newsgroup that (I presume)
discusses intellectual property issues; I haven't read it, but I'd
guess that all this has been discussed to death there. (They may even
have a FAQ list.)

The only C issue is whether it's possible to do what the OP was asking
about in standard C. The answer is no.

Next?

 

[protectlicense]

software activation

You should buy an software activation solution for licensing management. You will integrate their library and check license before allowing to execute your static library.

www.protectlicense.com