Testing the code generator and validator thoroughly is essential. Unit tests for code generation that produce valid codes, and validation tests for various scenarios like expired codes, invalid signatures, etc.

Documentation for administrators on how to generate codes would be necessary. A backend interface to manage generated codes, view statistics, etc.

Potential issues to avoid include weak encryption and poor error messages that might guide users in creating fake codes. The validation process should not give detailed feedback about the code's invalidity to avoid information leakage.

The code structure could be a string formatted with specific segments. For example, starting with a product identifier, then a checksum, then encrypted data. The software would parse the code, verify its checksum, decrypt the data, check the signature, and then validate dates or user data.

In terms of implementation, the code generation would be a separate tool. The software itself would have the validation logic, possibly calling an API or a library. For offline activation, maybe a keygen that requires manual input but uses a local database check.

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