by prompting for password every time you try to install a new app from google play, i now apple always ask even when downloading free apps but google play only prompt for password when purchasing a new app. i have an app called Applock that claims to password protect installing and uninstalling apps but it only works for uninstalling because when i download free apps from google play, there is no prompt for password. PLS let me know if you know any other app that actually works.