Title: Re: [office] auto-play presentation file format like PPS
Agree. The ISO PDF spec does not and I believe it is a wise approach.
Duane
On 25/03/08 11:33 AM, "Warren Turkal" <> wrote:
I can see a use for both encrypting and not encrypting the metadata. I
just don't want to see the standard define only a method that does not
encrypt the metadata.
wt
On Tue, Mar 25, 2008 at 11:13 AM, Duane Nickull <> wrote:
>
> 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" <> 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, <> 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" <>
> >
> > 03/24/2008 07:14 PM
> >
> > To
> >
> > cc
> >
> >
> > Subject Re: [office] auto-play presentation file format like PPS
> >
> >
> >
> >
> >
> >
> > On Mon, Mar 24, 2008 at 2:12 PM, David A. Wheeler <>
> > 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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