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Java based quiz ( how to prevent multiple installations )

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I am creating a java based application which will have some questions topic wise . I am planning to make it available to persons for some fee. I will distribute it via email attachments since I dont have a website to host.
I dont want people should be able to install the same copy on multiple machines .How can I achieve that (some licensing kind of thing)?

Also the questions will be in a file . How should I encrypt them so that they are not copied/decrypted easily ?
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Please dont post the same question in multiple fora.
Lets continue the discussion at
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