Notarization Requirement for Mac Software

Mac apps, installer packages, and kernel extensions that are signed with Developer ID must also be notarized by Apple in order to run on macOS Catalina. This will help give users more confidence that the software they download and run, no matter where they get it from, is not malware by showing a more streamlined Gatekeeper interface.

Learn more

from News - Apple Developer https://apple.co/2HSZcdy