62 lines
3.4 KiB
Plaintext
62 lines
3.4 KiB
Plaintext
page.title=Application Licensing
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@jd:body
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<p>Google Play offers a licensing service that lets you enforce licensing policies for
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applications that you publish on Google Play. With Google Play Licensing, your application can
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query Google Play at run time to obtain the licensing status for the current user, then allow or
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disallow further use as appropriate. </p>
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<p>Using the service, you can apply a flexible licensing policy on an application-by-application
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basis—each application can enforce licensing in the way most appropriate for it. If necessary,
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an application can apply custom constraints based on the licensing status obtained from Google Play.
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For example, an application can check the licensing status and then apply custom constraints
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that allow the user to run it unlicensed for a specific validity period. An application can also
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restrict use of the application to a specific device, in addition to any other constraints. </p>
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<p>The licensing service is a secure means of controlling access to your applications. When an
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application checks the licensing status, the Google Play server signs the licensing status
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response using a key pair that is uniquely associated with the application. Your application
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stores the public key in its compiled <code>.apk</code> file and uses it to verify the licensing
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status response.</p>
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<p>Any application that you publish through Google Play can use the Google Play Licensing
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service. No special account or registration is needed. Additionally, because the service uses no
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dedicated framework APIs, you can add licensing to any application that uses a minimum API level of
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3 or higher.</p>
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<p class="note"><strong>Note:</strong> The Google Play Licensing service is primarily intended
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for paid applications that wish to verify that the current user did in fact pay for the application
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on Google Play. However, any application (including free apps) may use the licensing service
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to initiate the download of an APK expansion file. In which case, the request that your application
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sends to the licensing service is not to check whether the user paid for the app, but to request the
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URL of the expansion files. For information about downloading expansion files for your application,
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read the guide to <a href="{@docRoot}google/play/expansion-files.html">APK Expansion Files</a>.</p>
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<p>To learn more about Google Play's application licensing service and start integrating it into
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your applications, read the following documents:</p>
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<dl>
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<dt><strong><a href="{@docRoot}google/play/licensing/overview.html">Licensing
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Overview</a></strong></dt>
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<dd>Describes how the service works and what a typical licensing implementation looks
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like.</dd>
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<dt><strong><a href="{@docRoot}google/play/licensing/setting-up.html">Setting Up for
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Licensing</a></strong></dt>
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<dd>Explains how to set up your Google Play account, development environment, and
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testing environment in order to add licensing to your app.</dd>
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<dt><strong><a href="{@docRoot}google/play/licensing/adding-licensing.html">Adding
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Licensing to Your App</a></strong></dt>
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<dd>Provides a step-by-step guide to add licensing verification to your application.</dd>
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<dt><strong><a href="{@docRoot}google/play/licensing/licensing-reference.html">Licensing
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Reference</a></strong></dt>
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<dd>Provides detailed information about the licensing library's classes and the service response
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codes.</dd>
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</dl>
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