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I'm planning to develop an open source application and am also considering to set a non-zero price for it.

If an user purchases the app, will he be charged again when updates are released?

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up vote 6 down vote accepted

From my experience with the Software Center and the Humble Indie Bundle apps, no, they will not be charged again. I've installed updates to Bastion without any re-payment, though I redeemed the Bundle apps via the gift codes, so it might be different for store-bought apps.

Technical

When you purchase an app, it adds a private repository (a.k.a. PPA, or personal package archive) to the folder /etc/apt/sources.list.d, e.g. private-ppa.launchpad.net_commercial-ppa-uploaders_bastion_ubuntu.list. The URL inside the file does not change when the app is updated, so I assume you will never have to re-purchase as long as the app is not republished under a new name.

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Thank you, and the additional details are very helpful, too. –  Paulo Feb 1 '13 at 3:07
    
@Shane can change the assumption to fact. You will not be charged for updates. –  zoopster Apr 29 '13 at 15:18
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The answer is no, they will not be charged again if updates to the app are released.

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