All the data used by the application are saved on a local database or in files. If the data are saved in files it's because you choose to do it (by using import/export functions). The application doesn't create file without your permission.
The application doesn't collect any personal data.
Digicode only use your geolocation if you have enabled the feature. Digicode only compute your geolocation one time when you start the application, and any time when you ask for it by using the functionnality in the application.