Google has finally started clamp down hard on unauthorized use of Google Android apps. The search giant is blocking the illicit devices from logging in to the Android apps, spotted by XDA developers. Google has been testing the action for quite some time, but now expanding it to a wider scale. The unlicensed devices trying to access the Google prime apps will receive a message stating, &ldquo;Device is not certified by Google&rdquo;.The pre-installed Android apps including Google Play Store, Gmail, Google Maps and other you see are not available for free. The company licensed these apps to the device maker and holds the authority to decide how the operating system will work. This is the reason whenever you bought a new Android phone you don&#39;t need to download basic Android apps and they cant be deleted either.While providing the license Google test the device against a set of requirements that will define the device&#39;s compatibility. The device that matches the requirement are given the authorization and named as &lsquo;Android&rsquo; device. However, the devices failed in the test are rejected by Google and these devices are known as Android fork. As Google apps are also available on forums, third-party app stores or custom ROM sites, these Android fork devices download the apps from there. In order to stop these activities, the company is now blocking the access of these devices to the Android apps.Amazon&#39;s Kindle Fire products are the best example of Android fork, the company ships most of the Kindle products to China where Google isn&#39;t much into the business. While operating an Android fork device whenever a user tries to access any of the Google apps, the attempt is blocked by the company. A warning message pops up saying the device manufacturer has pre-installed the apps without Google authorization. The users replacing the stock Android with custom ROM Android will also face similar access block. However, Google has given an option to them, they can enter their Android ID and that will register the device to the Google account.Google took the initiative to stop the sellers and the manufacturers from shipping Android fork devices to their customer by installing the Google apps unauthorisedly. The alert pop up from Google while singing to the Google apps will warn the users that something is wrong with the device. The tech giant has started to take serious steps against Android vulnerabilities as the company is ready to push Android P later this year.