Page rotation and signature field

Hello,
I'm requesting some help because I spent too much time comparing my PDFs to see where I am wrong.
I got a document with a clockwise rotation of 90 degrees for every pages. The conforming readers apply the
rotation to display the content in a readable fashion.
So, when I sign the document (with a visible signature field), the signature visual representation is rotated. I got back to ISO 32000-1
and discovered the MK dictionary of widget annotations (table 188).
Here is an example of the widget annotations I'm producing now:
5651 0 obj
<</MK <</R 90>>/F 4/Type /Annot/Subtype /Widget/Rect [100.0 475.0 356.0 731.0 ]/FT /Sig/DR <<>>/T (Sign5929838)/V 5649 0 R/AP <</N 5661 0 R>>/P 5629 0 R>>
endobj
But the signature representation is not correctly aligned.
I compared to what Acrobat 8 Professional is doing. Until now, I found no differences, but those signatures are correctly aligned.
5636 0 obj
<</Rect[39.8122 525.182 153.319 702.22]/Subtype/Widget/F 132/P 5634 0 R/T(Signature2)/V 5660 0 R/DA(/MyriadPro-Regular 0 Tf 0 Tz 0 g)/FT/Sig/Type/Annot/MK<</R 90>>/AP<</N 5637 0 R>>>>
endobj
(Acrobat is re-ordering objects before saving the file)
Well, I think I need some fresh look to understand when I went wrong.
Here are the complete files:
http://www.terafiles.net/v-121441.html (by me)
http://www.terafiles.net/v-121442.html (by Acrobat)

Ok, I finally found out what's going on backstage.
The /R entry of the MK dictionary is just some informative statement. It does not make the PDF reader tilt the signature field.
Acrobat modifies the current transformation matrice to do so.
It's sad it's not clearly stated in the ISO standard...

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Hello,
I found out that you can rotate signature fields the same way you rotate pages (using the MK dictionary of the widget annotation).
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From: Adobe Forums <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Date: Tue, 27 Sep 2011 07:45:15 -0700
To: Leonard Rosenthol <[email protected]<mailto:[email protected]>>
Subject: Signature field rotation
Signature field rotation
created by Clément K.<http://forums.adobe.com/people/Cl%C3%A9ment+K.> in PDF Language and Specifications - View the full discussion<http://forums.adobe.com/message/3940485#3940485

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