Samsung Galaxy S4 User Manual page 406

Unknown Sources
Before you can download a web application you must enable the
Unknown sources feature (enables downloading). Developers can
use this option to install non-Play Store applications.
1. From the main Settings page, tap More tab
2. Tap Unknown sources to active this feature.
Verify Apps
Allows you to block or warn yourself before installing apps that can
cause harm.
1. From the main Settings page, tap More tab
2. Tap Verify apps to active this feature.
Note: Enabling this feature can prevent installation of some
applications from the Play Store.
Credential Storage
This option allows certain applications to access secure certificates
and other credentials. Certificates and credentials can be installed to
the SD card and password protected.
1. From the main Settings page, tap More tab
2. Tap Trusted credentials to display only trusted CA certificates. A
check mark displayed next to the feature indicates secure
credentials.
3. Tap Install from device storage to install encrypted certificates
from the USB Storage location.
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Security.
Security.
Security.