I need to activate a private area for every my drupal users, an area where I (admin) can insert some files and only users owner can download it, I mean

I (admin) can upload filenameA.pdf in userA area and userA only can download but not edit/delete it

I (admin) can upload filenameB.pdf in userD area and userB only can download but not edit/delete it

I (admin) can upload filenameC.pdf in userC area and userC only can download but not edit/delete it