Incorporating shareware restrictions in C++ software

Question

I wish to implement my software on a shareware basis, so that the user is given a maximum trial period of (say) 30 days with which to try out the software. On purchase I intend

Answer 1

Please see this library.

Description:

Convert any application into time-limited shareware. Generate serial numbers to register it. A function library offering a flexible locking system with solid encryption. Easy to implement. Support for VB, C++, Delphi, other languages.