Re: [Fed-Talk] Fed-talk Digest, Vol 10, Issue 183
Re: [Fed-Talk] Fed-talk Digest, Vol 10, Issue 183
- Subject: Re: [Fed-Talk] Fed-talk Digest, Vol 10, Issue 183
- From: "Miller, Timothy J." <email@hidden>
- Date: Thu, 17 Oct 2013 18:07:20 +0000
- Thread-topic: [Fed-Talk] Fed-talk Digest, Vol 10, Issue 183
Quartz 2D is basically "Display PDF." :)
-- T
On 10/17/13 11:53 AM, "Todd Heberlein" <email@hidden> wrote:
>
>On Oct 17, 2013, at 5:14 AM, Miller, Timothy J. <email@hidden> wrote:
>
>
>PDF was originally just a simplified version of Postscript. Postscript is
>a full-fledged programming language, and malicious Postscript is known in
>the wild (most commonly used to attack printers and printer drivers).
>
>
>
>
>I used to write "programs" directly in PostScript, mainly just to draw
>figures (not malware, honest:)
>
>
>And of course NeXT's display engine was Display Postscript. (They ripped
>it out before Mac OS X was released (rumors were that it was a licensing
>issue with Adobe)).
>
>
>Then Adobe *added the programming language features back*. Much fun has
>since ensued.
>
>
>
>
>
>I did not know that. :) I'll have to reexamine the specs.
>
>
>FWIW, Postscript is classified Cat 2 Mobile Code under DoDI 8552.01, while
>PDF was Cat 3. Since 2011 PDF is classed as Cat 2. This categorization
>is based on analysis of the PDF specification, not the implantation of any
>particular PDF renderer.
>
>PDF/A could probably still be considered Cat 3, but it's probably not safe
>to try to make fine-grained distinctions within the PDF specs. How many
>people can tell PDF from PDF/A from PDF/X?
>
>
>
>
>
>Interesting. I was an expert witness on a couple of patent cases, and
>defining "claim terms" is an incredibly important yet incredibly fuzzy
>process. For example, distinguishing between analyzing a "document"
>versus "executable code" can be be important
> when determining if something counts as prior art to invalidate a patent
>(looking backwards in time) or infringe on the patent (looking forward in
>time).
>
>
>At one point I was describing how a Postscript "document" could be
>considered a "program". Having those government classifications would
>have been very valuable to me at the time.
>
>
>Todd
>
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