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Asked: 2026-05-11T07:36:46+00:00

I have this java swing application that I intend to sell over the internet.

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I have this java swing application that I intend to sell over the internet. At the moment I’m leaning towards deploying the application using java webstart. The product will be licensed for the user to use the program on one computer at a time only. I am concerned about piracy with this model. I would like to install some security features to enforce the license model. The goal is to at least make it difficult for a licensed user to copy the installed product including license key to unlicensed users. Here are the options I am looking at now:

  1. Force the user to authenticate to the mother ship with a username/password each time the program is launched.

  2. Simply install a license key somewhere (hidden?) on the users PC after they have registered and paid. At runtime, verify that there is a valid license key installed.

  3. Use/build a security package that is based on a hardware fingerprint of the users computer. This fingerprint would be computed each time the app is started and compared with the locally installed license key using some sort of hash. This license key would be would only be valid with this hardware fingerprint.

One of the issues here is that once this application is installed, there isn’t any runtime need for the application to contact the mother ship, other than checking for application updates using java webstart. Everything the app does it does locally and displays the results to the user using swing. So any solution involving a mother ship would basically mean building a server infrastructure for the sole purpose of license verification.

I guess what I’m looking for is something java based that is at least somewhat secure, easy to deploy and is not a pain for the user. What security/licensing approach have you used?

EDIT: I should add that I am not necessarily looking for a silver bullet to prevent absolutely everyone from defeating security. There will always be someone with enough time on their hands to find ways to get it done. I’m not so concerned with these guys. I’m basically looking to make it difficult for a casual user to simply copy the license key and send to his buddies. Implemented correctly, the solution should convince the casual user that it is simpler to just buy it.

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  1. I’d say (2) is your best bet. You’ve already talked yourself out of (1), and (3) would cause problems if the user, say, bought a new motherboard. (2) won’t be much protection against a reasonably computer-savvy user, but it shouldn’t cause too many problems either.

    But in the end, nothing you can do will stop a determined user from pirating your software.

    In fact, the most effective anti-piracy software development strategy is the simplest one of all:

    1. Have a great freaking product.
    2. Charge a fair price for it.

    — Jeff Atwood

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