You can use the chattr command (as root) to make a file “unalterable” so that even the root user cannot modify or delete it without using the chattr command to revert the change. This is done by using chattr’s +i and -i flags.

chattr changes a file’s attributes on a Linux file system.

Set the flag as root:

# chattr +i xrdp-notes.txt # lsattr xrdp-notes.txt ----i---------e------- xrdp-notes.txt