Non-Project Files Protection dialog
This dialog appears when you try to edit non-project files: library sources, external sources and so on. Such files are intentionally protected from modification. For example, it is not recommended that you change library classes as you are supposed to reuse them as is.
These files do not belong to the project
This area displays a non-project file that you are trying to edit.
I want to edit this file anyway
Select this option to disable protection for the listed files.
I want to edit all files in this directory
Select this option to disable protection for the listed files and all files in the same directory.
I want to edit any non-project file in the current session
Select this option to disable protection completely.
All options are effective during the current session, once the IDE is restarted, protection will be re-enabled. Also, you cannot change your decision for a particular file within the current session.