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Cool trial strategy

I know that there are already similar questions on SO. But my question is more theoretical.

I am wondering if it is possible to create a reliable trial system? By exposed, I mean a system that cannot be cracked even if the cracker knows the algorithm of such a system?

Sorry if this is not a programming issue.

Edit: I think I should make my question more practical. I ask about the whole system, and not about a separate application. The system consists of a Linux PC and some associated hardware. Maybe I can use hard disk encryption?

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For example, you can leave a small but key part of the code, and require that the code be downloaded from the server you are managing. This allows you to track trial activity and disable specific users. However, as soon as they receive the code, as soon as they can capture it, and create an unspent version of your product, getting enough work.

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Source: https://habr.com/ru/post/1707854/

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