title: Android Known Sources
body: <p>When you install an apk file that is from an unknown source, Android will complain and verify that you want to install that apk file. This file must be checked to a list of known sources. </p>
  
  <p>I am interested to know where that list of known sources is located on Android AOSP.</p>
  
  <p>Edit:
  I apologize if my question is confusing but allow me to clarify. When you install an APK from usb or email Android will prompt you saying you are installing an app from an unknown source. At this point you can either deny or accept that fact and move on. In order to determine if an app is being installed from an unknown source, I am <strong>assuming</strong> that there is a list of known sources that is included with AOSP. I may be wrong, as one comment has pointed out that it's just all apps that are not installed from the google play store.</p>
  
  <p>I would like to see where this check is done. Where in AOSP is this check made if there is no list, or where is this list of known sources if there is a list.</p>