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Editorial Team
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Asked: 2026-06-03T15:26:22+00:00

There are some apps which when bought make you enter a secret key of

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There are some apps which when bought make you enter a secret key of some sort to prove you bought the thing. Cool, but how is that done? Not for hacking, but out of curiosity. Does it even work?

Say for example,

  1. a fictional ACME company developed the AcmeSuperDuperSlider.
  2. Which one buys and uses on 1 domain.

How does the app know when it is used on a different domain? Web Services?

I may need to lock something down before deployment so I’m looking for advice.

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1 Answer

  1. Editorial Team

    This is never done in JavaScript, as the source isn’t hidden from the user.

    You’d have to use some sort of server-side language and check the value of the HTTP header REQUEST_URI (or its equivalent).

    In JavaScript, you can check window.location, but like I said, it’s rather pointless.

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