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Subject: Re: [office] auto-play presentation file format like PPS
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 <dnickull@adobe.com> 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" <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 > > > > --------------------------------------------------------------------- > > To unsubscribe from this mail list, you must leave the OASIS TC that > > generates this mail. You may a link to this group and all your TCs in > > OASIS > > at: > > > > > > https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php > > > > > > > > --------------------------------------------------------------------- > To unsubscribe from this mail list, you must leave the OASIS TC that > generates this mail. You may a link to this group and all your TCs in > OASIS > at: > https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php > > > > -- > ********************************************************************** > "Speaking only for myself" > Senior Technical Evangelist - Adobe Systems, Inc. > Blog - http://technoracle.blogspot.com > Community Music - http://www.mix2r.com > My Band - http://www.myspace.com/22ndcentury > Adobe MAX 2008 - > http://technoracle.blogspot.com/2007/08/adobe-max-2008.html > ********************************************************************** >
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