Where to Store the Protection Trial Info for Software Protection Purpose

Question

It might be duplicate with other questions, but I swear that I googled a lot and search at StackOverflow.com a lot, and I cannot find the answer to my question:

In a C#.

Answer 1

You won't find a single perfect solution. The efforts you put into this should be proportional to the price of the product you make. If it's worth a lot, then buy a professional solution. If not, then use any combination of methods that you find. Use the registry, request an online trial key, check if the user manipulates the system time, and so on.