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Groups > comp.sys.acorn.misc > #2851

Re: Protected PDF Files

From Martin Wuerthner <spamtrap@mw-software.com>
Newsgroups comp.sys.acorn.misc
Subject Re: Protected PDF Files
Date 2011-12-07 17:38 +0100
Organization MW Software
Message-ID <a23bf03d52.martin@bach.planiverse.com> (permalink)
References <523de26065see.sig@walkingingermany.invalid> <m2hb1c8msz.fsf@unknown-00-23-6c-8d-9e-26.lan> <79bae83d52.martin@bach.planiverse.com> <523dec6217see.sig@walkingingermany.invalid>

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In message <523dec6217see.sig@walkingingermany.invalid>
          Russell Hafter News <see.sig@walkingingermany.invalid> 
wrote:

> In article <79bae83d52.martin@bach.planiverse.com>, Martin
> Wuerthner <spamtrap@mw-software.com> wrote:
>> In message <m2hb1c8msz.fsf@unknown-00-23-6c-8d-9e-26.lan>
>>           Raymond Wiker

>>> As far as I know, the PDF "protection" is worthless...
>>> it is simply a flag that it is up to the application to
>>> honour.

>> Yes, but as far as I know all RISC OS software honours
>> the protection flag. However, as soon as the flags allow
>> the document to be printed (and they usually do, because
>> that is the whole point of sending PDF invoices around),
>> then even that does not mean anything because you can
>> print to PostScript, which recovers all vector content
>> without any protection. Then, you can convert it back to
>> an unprotected PDF file.

> And presumably there is no flag that says "do not export as
> Drawfile"?

That does not really matter. The usual convention is that exporting in 
an editable format is interpreted as editing, or at least preparing to 
edit, so this is covered by the "do not edit" flag.

The conceptual problem is that certain types of printing (PostScript) 
are effectively equivalent to exporting the file in an editable 
format, so the very common flag combination "Printing: yes, Editing: 
no" cannot really be enforced.

-- 
Martin
---------------------------------------------------------------------
Martin Wuerthner         MW Software      http://www.mw-software.com/
        RISC OS Software for Design, Printing and Publishing
---------------------------------------------------------------------

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Thread

Protected PDF Files Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-07 14:07 +0000
  Re: Protected PDF Files charles <charles@charleshope.demon.co.uk> - 2011-12-07 14:37 +0000
  Re: Protected PDF Files Raymond Wiker <raw@unknown-00-23-6c-8d-9e-26.lan> - 2011-12-07 15:43 +0100
    Re: Protected PDF Files Martin Wuerthner <spamtrap@mw-software.com> - 2011-12-07 16:16 +0100
      Re: Protected PDF Files Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-07 15:56 +0000
        Re: Protected PDF Files Martin Wuerthner <spamtrap@mw-software.com> - 2011-12-07 17:38 +0100
          Re: Protected PDF Files Richard Porter <dontusethis@address.uk.invalid> - 2011-12-12 23:27 +0000
            Re: Protected PDF Files Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2011-12-13 02:45 +0000
              Re: Protected PDF Files Martin Wynn <m.wynn@blueyonder.co.uk> - 2011-12-13 17:27 +0000
              Re: Protected PDF Files Richard Porter <dontusethis@address.uk.invalid> - 2011-12-28 21:46 +0000
                Re: Protected PDF Files Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-29 04:30 +0100
                Re: Protected PDF Files Russell Hafter News <see.sig@walkingingermany.invalid> - 2012-01-04 18:01 +0000
      Re: Protected PDF Files charles <charles@charleshope.demon.co.uk> - 2011-12-07 15:57 +0000
        Re: Protected PDF Files Martin Wuerthner <spamtrap@mw-software.com> - 2011-12-07 17:43 +0100
      Re: Protected PDF Files Gwyn <gwyn@gwyn-oakley.org.uk> - 2011-12-08 13:01 +0000
        Re: Protected PDF Files Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-08 17:18 +0000
          Re: Protected PDF Files druck <news@druck.org.uk> - 2011-12-10 10:56 +0000
            Re: Protected PDF Files Chris Evans <chris@cjemicros.co.uk> - 2011-12-12 11:58 +0000
              Re: Protected PDF Files Richard Porter <dontusethis@address.uk.invalid> - 2011-12-12 23:02 +0000
            Re: Protected PDF Files Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-12 16:57 +0100
              Re: Protected PDF Files druck <news@druck.org.uk> - 2011-12-13 21:05 +0000
                Re: Protected PDF Files NedA <news@ned.uk.invalid> - 2011-12-13 22:04 +0000

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