In scheduler, it would not have to allow to erase no
user who was not the user who has created the note or
to the owner of scheduler.
I have a scheduler shared to multiple users.
User A, write a note.
Then User B, can read but not erase the note of User A, but
the User B have that can write our notes in same scheduler.
If User B is the owner of scheduler, then permit it to
erase any note from others users.
Actually, any users can write in same scheduler, can
erase any note, is not all right.
(sorry for my english :) )