but what shall i do if within time I need to change passwords so I need to change them in the SecNotes?
PW for every note is permanent. You can't ever change it.
this is inconvenient ... it turns out that 1 password changes, and you need to start a new notebook, when other valid passwords remain in the old one
look, every note needs own pw, neither a note or pw can be changed. you can create own ow for any note. is that clear?