Protecting software with license keys?
I have written some programs in C++ but need to find a way to "serial-protect them" and have keys that work for X days (like, "enter a valid serial for a one month, one year, or 2 year trial/use") Are there any free/open source or whatever methods to taking a single .exe file (I made them portable with ThinApp) and having the NSIS (or other extractor) prompt for a serial, and (for my part of the job, a key generator for my own software)? I need it (my generator/encryptor) to be able to activate the software for a given (preset) duration.
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