Licensing Your Applications
Android Market offers a licensing service that lets you enforce licensing policies for paid applications that you publish through Android Market. With Android Market Licensing, your applications can query Android Market at run time to obtain their licensing status for the current user, then allow or disallow further use as appropriate.
Using the service, you can apply a flexible licensing policy on an application-by-application basis — each application can enforce licensing in the way most appropriate for it. If necessary, an application can apply custom constraints based on the licensing status obtained from Android Market. For example, an application can check the licensing status and then apply custom constraints that allow the user to run it unlicensed for a specific number of times, or for a specific validity period. An application can also restrict use of the application to a specific device, in addition to any other constraints.
The licensing service is a secure means of controlling access to your applications. When an application checks the licensing status, the Market server signs the licensing status response using a key pair that is uniquely associated with the publisher account. Your application stores the public key in its compiled .apk file and uses it to verify the licensing status response.
Any application that you publish through Android Market can use the Android Market Licensing service. No special account or registration is needed. Additionally, because the service uses no dedicated framework APIs, you can add licensing to any legacy application that uses a minimum API level of 3 or higher.
To help you add licensing to your application, the Android SDK provides library sources that you can include in your application project. The License Verification Library (LVL) handles all of the licensing-related communication with the Android Market client and the licensing service. With the LVL integrated, your application can determine its licensing status for the current user by simply calling a library checker method and implementing a callback that receives the status.
This document explains how the licensing service works and how to add it to your application.
http://developer.android.com/guide/publishing/licensing.html
Using the service, you can apply a flexible licensing policy on an application-by-application basis — each application can enforce licensing in the way most appropriate for it. If necessary, an application can apply custom constraints based on the licensing status obtained from Android Market. For example, an application can check the licensing status and then apply custom constraints that allow the user to run it unlicensed for a specific number of times, or for a specific validity period. An application can also restrict use of the application to a specific device, in addition to any other constraints.
The licensing service is a secure means of controlling access to your applications. When an application checks the licensing status, the Market server signs the licensing status response using a key pair that is uniquely associated with the publisher account. Your application stores the public key in its compiled .apk file and uses it to verify the licensing status response.
Any application that you publish through Android Market can use the Android Market Licensing service. No special account or registration is needed. Additionally, because the service uses no dedicated framework APIs, you can add licensing to any legacy application that uses a minimum API level of 3 or higher.
To help you add licensing to your application, the Android SDK provides library sources that you can include in your application project. The License Verification Library (LVL) handles all of the licensing-related communication with the Android Market client and the licensing service. With the LVL integrated, your application can determine its licensing status for the current user by simply calling a library checker method and implementing a callback that receives the status.
This document explains how the licensing service works and how to add it to your application.
http://developer.android.com/guide/publishing/licensing.html
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