I wrote: (regarding enabling comments in PDFs)

I wonder if either (or both) of these:

<http://shop.pdf-office.com/product_info.php?products_id=34&osCsid= a1241e335670fc0b939a8c03b77536f2>

<http://shop.pdf-office.com/product_info.php?products_id=47&osCsid= a1241e335670fc0b939a8c03b77536f2>

allow it ?

well, I took the plunge and applied for demos of both. It looks like neither does the trick. mark.

Henning Hraban Ramm wrote:

Am 05.01.2005 um 12:03 schrieb Mark Smith:

...

The general opinion was that this is effectively an Acrobat-only feature. In fact, it seems that one needs Acrobat 6 or 7 Pro to enable commenting in this way and that (at least on Mac) the "commmenting author" needs Reader 7 to be able to participate. That said, it was

The other way round: You need Acrobat 7 Pro to enable "Reader Extensions" for a document, afterwards you can comment PDFs with Reader 6 or 7

Same way round actually. 7 Pro enables the enabling of comments (a paraphrase of "enables commenting") in a document. The "commenting author" is the one who writes the comments and needs (as I said) on Mac (I believe), Reader 7. We are saying the same thing. The meat of the thread was more about the how-to's and why-not's of enabling "Reader Extensions" w/o 7 Pro.

Henning Hraban Ramm wrote:

Am 05.01.2005 um 12:03 schrieb Mark Smith:

...

The general opinion was that this is effectively an Acrobat-only feature. In fact, it seems that one needs Acrobat 6 or 7 Pro to enable commenting in this way and that (at least on Mac) the "commmenting author" needs Reader 7 to be able to participate. That said, it was

The other way round: You need Acrobat 7 Pro to enable "Reader Extensions" for a document, afterwards you can comment PDFs with Reader 6 or 7

can you make me a small document that has the reader extensions enabled? Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Henning Hraban Ramm wrote:

I'd like to, but there's no german Acrobat 7 yet, and I won't buy an english one.

Interesting. I'm in Germany too and am currently having trouble getting an international English version of 7 Pro at the education price. A German one is on offer.

Hans Hagen wrote:

you can read comments in the reader, but not add them; but you can use tex to add them and the reader will recognize them

Hope I'm not misrepresenting anyone here, but I think the utility of this function for [Con|La]TeX[t] users is not so much in being able to add comments oneself in the input file(s) (though this has its uses), but in being able to send a draft PDF to non-TeX-savvy co-authors +/or editors and giving them (more or less) free reign to add their comments to it, if possible w/o completely destroying any security. (I'm currently having to generate RTF or "Word HTML" drafts for such purposes.) mark.

Vit Zyka wrote:

...

Do we have a ConTeXt tool which can enable users of e.g. AdobeReader 7 to add comments to PDF files ? Or is it true that this "comments enabled flag" can only be set for PDFs generated by Acrobat -- and only by the original author?

I have played with this yesterday evening, but without success. I tried

\pdfcompresslevel=0 \pdftrailer{/Encrypt << /Filter /Standard /V 1 /R 2 /P 252 >> } Hallo \end

technically it's possible to have no password (at least the specs say so) but i can't get it working; do you have a file without password that is editable made by another app? Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Vit Zyka wrote:

...

...

I have played with this yesterday evening, but without success. I tried

\pdfcompresslevel=0 \pdftrailer{/Encrypt << /Filter /Standard /V 1 /R 2 /P 252 >> } Hallo \end

technically it's possible to have no password (at least the specs say so) but i can't get it working;

do you have a file without password that is editable made by another app?

Unfortunately not. Using pdfcrypt I created encrypted but not editable PDF, see http://typokvitek.com/tmp/pdfpermit3.pdf open password 'A', user password 'B'.

it looks like something needs to be done with the stream as well; simply setting a password fails (even the empty one, the funny hex stream); btw, your 252 should be a negative number) so ... we need more info Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Vit Zyka wrote:

I see. I have to read the specification notes... But in this case the flag number for allowing everything is -4. (see http://typokvitek.com/tmp/pdfpermit4.pdf)

In this case all Document Security are allowed, but not Document Restrictions Summary!? Bu still no success with commenting...

can you make a file with no password? ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Vit Zyka wrote:

...

can you make a file with no password?

No. You wrote that this possibility is mentioned somewhere. Where?

in the pdf specs \starttext \startcomment should work in older readers as well \stopcomment \input bryson \def\pdfnopwdstr{28bf4e5e4e758a4164004e56fffa01082e2e00b6d0683e802f0ca9fe6453697a} \immediate\pdfobj {<< /Filter /Standard /V 1 /R 2 /P -4 /O <\pdfnopwdstr> /U <\pdfnopwdstr> >>} \pdftrailer{/Encrypt \the\pdflastobj\space 0 R} \stoptext however, it does not work Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Vit Zyka wrote:

And sorry for a bit out of ConTeXt topic. Hans, is it time to move to the pdftex list?

no problem, that way users see that things are not always trivial; and ... the pdftex list nowadays is mostly a latex howto list Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Hans Hagen wrote:

Vit Zyka wrote:

interesting is that the doc opens but the menu bar freezes -)

\starttext

\startcomment should work in older readers as well \stopcomment \input bryson

\pdfcompresslevel=0

\immediate\pdfobj{<< /Type /Sig /Filter /Identity /P 2 >>} \edef\DocMDPobj{\the\pdflastobj\space 0 R } \immediate\pdfobj{<< /Type /Sig /Filter /Identity /P 2 >>} \edef\URRRobj {\the\pdflastobj\space 0 R }

\pdfcatalog{/Perms << /DocMDP \DocMDPobj /UR3 \URRRobj>>}

\stoptext

A have had a second look at the Document Permitions. AFAIK and if Adobe does not have some bitter secret the situation is as follow: 1) if you want to permit additional document rights available in AR 6,7 (like commenting, saving, loading and sending form data) you need to sign document. (pgs. 684-700) 2) to sign document you need a) privat/public key generator and b) calculate document diggest (number; sum of integers from (nearly) all doc dictionary keys and values; alg. p. 1037). Bellow is the document skeleton for that. There should be: 1) filled the comment lines started by %! (diggest and signature values) 2) perhaps also %? (depends on %!) 3) perhaps the FormSig field is not needed ??? So, to do that, pdfTeX should start to calc document diggest and there should be standard(?) process of signing this value. Vitek Zyka ------------------------------------------------------------------ \pdfoptionpdfminorversion=6 \pdfcompresslevel=0 \def\defObj#1#2{% \immediate\pdfobj{#2}% \edef#1{\the\pdflastobj\space 0 R }% } %--- MDP \defObj\objTransformParamsMDP{<< /Type /TransformParams /P 3 /V /1.2

...

}

\defObj\objSigRefMDP{<< /Type /SigRef /TransformMethod /DocMDP /TransformParams \objTransformParamsMDP %! /DigestMethod ? /MD5 | /SHA1 %!? /DigestValue ? () %!? /DigestLocation [? ?]

...

}

%--- UR \defObj\objTransformParamsUR{<< /Type /TransformParams /Document [/FullSave] /V /2.2 /Annots [/Create /Delete /Modify /Copy /Import /Export] % if UR3 also /Online /SummaryView /Form [/FillIn /Import /Export /SubmitStandalone /SpawnTemplate] % /Signature [/Modify] /P false

...

}

\defObj\objSigRefUR{<< /Type /SigRef /TransformMethod /DocUR /TransformParams \objTransformParamsUR %! /DigestMethod ? /MD5 | /SHA1 %!? /DigestValue ? () %!? /DigestLocation [? ?]

...

}

%--- Sig \defObj\objSig{<< /Type /Sig %! /Filter Adobe.PPKLite | Entrust.PPKEF | CICI.SignIt | VeriSign.PPKVS %? /SubFilter adbe.x509.rsa_sha1 | adbe.pkcs7.detached | adbe.pkcs7.sha1 % /Cert [] | () % only if /SubFilter adbe.x509.rsa_sha1 % /Contents (?) /Reference [ % \objSigRefMDP \objSigRefUR ] % /ByteRange [0 0] % should if used UR3 then can be ommited DiggestValue /V 1

...

}

%--- Perms \defObj\objPerms{<< /DocMDP \objSig /UR \objSig % /UR3 \objSig

...

}

%--- Sign Form \defObj\objFormSigField{<< /FT /Sig /T (SigFieldName) /V \objSig

...

} \defObj\objForm{<< /Fields [\objFormSigField] }

\pdfcatalog{/AcroForm \objForm /Perms \objPerms} \starttext \startcomment should work in older readers as well \stopcomment \input bryson \stoptext ----------------------------------------------------------------------

h h extern wrote:

Vit Zyka wrote:

...

So, to do that, pdfTeX should start to calc document diggest and there should be standard(?) process of signing this value.

how is that one calculated, imagine that in the %! fields you fill in placeholders like hereshouldgosomemagiccode, then one can run a script over the pdf, calculate that magic, and replace the string; maybe this can be hooked into xpdflib

Hans

Yes, I agree, postprocessing is possible. But I did not find any digest computing alg in the range of C/C++ or Perl. Also do not known links to xpdflib. Vit Zyka