A situation arises on iOS devices when an application is distributed outside the official App Store through an enterprise developer program but has not been explicitly trusted by the user. This occurs because iOS requires verification of the developer’s certificate to ensure app integrity and security. As an example, if a company distributes an internal application to its employees, and the employee has not yet trusted the company’s developer certificate, the application will initially be blocked from running.
This validation process is essential for maintaining the security and stability of the iOS ecosystem. It helps prevent the installation of malicious software from unverified sources, protecting user data and device functionality. The mechanism has evolved over time as Apple has sought to balance the flexibility of enterprise app distribution with the need for rigorous security protocols. This approach provides organizations with the capability to deploy custom applications while mitigating risks associated with unauthorized software.