[Bug 521533]

[Carsten Gräser]

I also stumbled about the fact that it seems to be impossible to have
multiple instances of the same filled in form under the same file name
and got the impression that "Save as..." does not work. After some
experimenting I found out the problem with "Save as...":

There's two places where form data is stored: .kde/* and the pdf-file
itself. Data is always saved to .kde/* (attached to filename?). If you
use "Save as" it's also stored to the file. The problem is that this is
not visible to the user and that .kde/* seems to have precedence. If you
want to fill the same form twice you can easily run into problems:

Case a: Since form data is visible after closing, reopening, or moving
the file, the user assumes that it's stored inside of the pdf. To fill a
form a second time he copies the filled in form into a new location and
changes the necessary data. Everything seems to work, but if he reopens
the original file all it's data is changed to what he entered in the new
place.

Case b: The user is aware that data is stored in the file only if he
used "Save as". After filling the form the first time he uses "Save as".
To fill the form a second time he copies the filled in form into a new
location and changes the necessary data and uses "Save as" again. Now
different data is saved in both versions of the file. But if he opens
version 1 again, he sees the changes he did in version 2. The reason for
this is that by changing version 2, the data in .kde/* is changed and
this seems to have precedence when viewing version 1. If you delete th
corresponding file in .kde/* you see what's stored in the file.

In both cases the user seems to have lost data. In a) this is true, in
b) his data is just not visible.

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https://bugs.launchpad.net/bugs/521533

Title:
  Okular stores form data in a different directory (possible leak of
  private data)

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