: An option to store the password securely within the application, allowing users to "unlock" the document in the future without re-typing the password, using secure storage APIs [2].
: Since the file is marked with a compression icon (\🗜), a feature to automatically extract contents to a secure, encrypted container within the app [2].
If you tell me your target platform, I can give you specific technical solutions for managing file security.
To help you build this, are you developing a (e.g., Windows/macOS) or a mobile app (iOS/Android)?