Remove write-protected audio files from my device

May 24, 2018
Can't change the name of the file as it is not allowed by library Overdrive application. Read-only box in Properties of the file is grayed-out. Cannot transfer files from the device since the book lending period has expired. This is the only time in many years I've experienced this problem--all other files on all my other devices have been delete-able and transferable. By the way, I did not write-protect these files. Stumped