allow you to record phone discussion only fully without data modifications (create a static file that cannot be changed and also be used in a courthouse (tribunal))
- create binary file with our format and encoding and do not allow conversions
- only read file with this app
- allow files saving
- read-only mode
- write mode when recording only and cannot change or modify file
- file created only after call's ending if leaving app before it finished to record then destroy everithing saved during call recording