From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: bug#27563: [PATCH v3 0/2] Make ghostscript reproducible.
Date: Fri, 7 Jul 2017 15:25:38 +0200
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 27563@debbugs.gnu.org

Hi Ludo,

On Fri, 07 Jul 2017 14:00:09 +0200
ludo@gnu.org (Ludovic Court=C3=A8s) wrote:

> Danny Milosavljevic <dannym@scratchpost.org> skribis:
>=20
> > Also, newer PDF files have an RDF header specifying some extra informat=
ion
> > in an XML-like format.  For example there's an instance UUID (PDF/A spe=
cifies
> > that it's recommended to set this to an empty string), and a document U=
UID.
> > The latter again is time-based. =20
>=20
> If it=E2=80=99s time-based, then the solution may be to honor SOURCE_DATE=
_EPOCH.

Upstream says definitely not.  The UUIDs are supposed to be unique and they=
 don't want anyone writing fixed UUIDs into documents (except for "" for th=
e instance ID which they themselves do).

I think there could be some enterprise search engine which associates a doc=
ument with other resources using the document UUID - and if everyone went a=
nd reused UUIDs it would be very confused.

That's why I left it off.