Re: [office] auto-play presentation file format like PPS

[Duane Nickull <dnickull@adobe.com>]

Title: Re: [office] auto-play presentation file format like PPS

For the ISO PDF specification and reference implementation, the ability to encrypt the entire package vs. the content except metadata is a decision left to the encrypter.  If you use Acrobat pro, you can toggle this preference. There is no one rule that universally applied to people using PDF.  For archiving PDF’s, it is often preferred to be able to preserve plain text metadata.  This also might help applications understand the encryption algorithm used and give them the ability to use the right key to open it.

As for the preferred opening, there is a way to save PDF as backwards compatible files (previous versions) and specify certain initial view settings however you cannot (to my knowledge) specify a preferred application that will override the base operating system preferences the SU of the O/S specified.  Such would be a minor security risks in some cases (such as telling it to open a PDF in a browser and pass it a URL to a porn site or some site to verify a user responded to add that use to a spam list).

Duane


On 25/03/08 10:49 AM, "Warren Turkal" <turkal@google.com> wrote:

> I think that it makes sense to include the "preferred" open method in
> the manifest.
>
> However, an encryption layer should probably encrypt the manifest as
> well. There's no reason to give an attacker any information.
>
> wt
>
> On Mon, Mar 24, 2008 at 5:57 PM,  <robert_weir@us.ibm.com> wrote:
> >
> > But even a PDF file could be opened in either Acrobat Reader or the full
> > Acrobat application (or their equivalents).
> >
> > It makes me wonder if this isn't better expressed at the packaging/manifest
> > level?
> >
> > We should think of our package format as being independent of whatever is in
> > content.xml.  In the future, our packaging conventions (Zip container +
> > manifest.xml + mimetype + thumbnail.png) could be used by other
> > applications.  At this level we define things like encryption and digital
> > signatures.  Is this the right place to define the preferred "open mode" of
> > the document, edit versus play versus whatever?
> >
> > This would also have the advantage of being able to detect this preference
> > quickly before decryption, which would be useful if there are two entirely
> > difference applications, like in the PDF case, but also where you might have
> > a lightweight screenshow viewer, fast to launch, versus a larger, slower
> > loading editor.
> >
> > -Rob
> >
> >
> >
> >
> >
> >  "Warren Turkal" <turkal@google.com>
> >
> > 03/24/2008 07:14 PM
> >
> > To dwheeler@dwheeler.com
> >
> > cc
> > office@lists.oasis-open.org
> >
> > Subject Re: [office] auto-play presentation file format like PPS
> >
> >
> >
> >
> >
> >
> > On Mon, Mar 24, 2008 at 2:12 PM, David A. Wheeler <dwheeler@dwheeler.com>
> > wrote:
> >  >  E.G., in the "one laptop per child" system, it'd make sense to have a
> > lot of
> >  >  textbooks in OpenDocument format that are normally opened in a "browser"
> >  >  (read-only) mode, while other documents that you're working on would be
> >  >  opened using an editor.  (The browser might be optimized just for
> > reading).
> >
> >  To play devil's advocate, wouldn't PDF be a better format for the use
> >  case of viewing (and not editing) a document?
> >
> >  wt
> >
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> >
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