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How to store sensitive information on client side using wpf

If it's on the client side, it's impossible to ever be 100% secure without server verification: you can't encrypt a decryption key, you have to leave it in plaintext somewhere.

At the same time it's normally sufficient to just add a verification to the licence - eg the certificate has a line which is the hash of the certificate, plus a salt hardcoded in your application. If the user tries to edit their licence, the hash will change and you can throw an error.

With decryption keys, you should look at public/private key pairs, but as above, you can't encrypt the decryption key (at least, not without storing another unencrypted key)

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