Issue 67749 - Save pdf documents from publication
Summary: Save pdf documents from publication
Status: CONFIRMED
Alias: None
Product: Writer
Classification: Application
Component: save-export (show other issues)
Version: current
Hardware: All All
: P3 Trivial (vote)
Target Milestone: ---
Assignee: AOO issues mailing list
QA Contact:
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-07-25 10:48 UTC by h.ilter
Modified: 2013-02-07 22:40 UTC (History)
3 users (show)

See Also:
Issue Type: ENHANCEMENT
Latest Confirmation in: ---
Developer Difficulty: ---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this issue.
Description h.ilter 2006-07-25 10:48:49 UTC 
Let's say you provide regular confidential pdf document's to a group by mail.
Suddenly you will be informed, that the confidential pdf document is public in
any forum.
What the recipient-group doesn't know, the pdf document is hidden coded.
You download the public pdf document from forum und look to the code to catch
the sender. 
This kind of protection may also interesting for other file formats.
Comment 1 jmills 2006-07-25 11:35:23 UTC 
I heard a similar variation to this once.

Same scenario, except that a _printed_ copy of the document appears in public.

A hidden code in the ODA file doesn't help here ...

So what this idea was is that the user ID varied the kerning very slightly.  Not
enough for the human eye to see, but enough
for a copier to promulgate and enough for a scanner to detect.

You scan the released copy, compare it against an untainted version ... note the
difference in kerning and extract the original ID of the person who leaked it
into public domain.

You can then ask him awkward questions.

Jonathan