Gatekeeper and application permissions

Gatekeeper checks downloaded software before its first launch. It verifies signing and notarization information, checks for known malicious content, and asks you to confirm that you intended to open the download.

Prefer the App Store or software downloaded directly from a developer you trust. A valid signature identifies the signer and detects later changes; it does not prove that every behavior in the app is safe for your data.

Treat warnings as a review point

If macOS blocks an application, confirm:

• you downloaded the intended file from the official source
• the developer documents the current macOS version
• the checksum or signature matches when the publisher provides one
• you understand why the app is not passing the normal check

Do not disable Gatekeeper globally to open one application. Do not follow an installation guide that asks you to remove security attributes or run an unexplained command as administrator.

Application permissions have different blast radii

Applications may request access to the camera, microphone, files, screen recording, accessibility controls, input monitoring, or Full Disk Access.

Accessibility and input-monitoring permissions can allow an app to control or observe other applications. Full Disk Access can expose data that normal sandbox rules would protect. Grant only the permission required for a feature you intentionally use.

Review permissions later in System Settings → Privacy & Security. Remove access you no longer need, then verify the application still performs the intended job.

Permission prompts can be triggered by a legitimate feature, but the prompt itself does not explain the whole data flow. Check whether captured data stays on the Mac or is sent to a service.

Try this: review one category in Privacy & Security. For each listed app, explain which feature needs that permission and remove nothing until you can verify the impact.