Unlocking an MS Power Point Presentation that is "read-only"

We have a few MS PPT presentations that are locked with a password and can only be read - not modified.
Problem is that the lady who created these for our organization passed away a few weeks ago and a quick search for the passwords were unsuccessful so far.
Going to more files to find the passwords is very time consuming - the changes we need to make need to be done in the next few days.

I did a quick google search if there is a way to bypass the password but didn't come up with anything.

So I decided to open these presentations in Keynotes not really expecting that this would make any difference.
But it turns out that when the presentation is opened in Keynotes, the password protected "read-only" presentation becomes fully editable (at least the various things I tried)
This also happens if the presentation is opened in Libre Office.
And when I then export the presentation from keynotes as an MS Power Point presentation, the password protection for "read-only" is gone.

I'm still shaking my head that it is that ridiculously easy to bypass the MS PPT read-only protection.

Any comments?

via ehMac.ca http://ift.tt/2b8G3SR