PDF Dateien signieren - Adobe Reader XI Problem

Hallo Community,
ich habe ein Problem beim digitalen Signieren von PDF Dokumenten im Adobe Reader (XI).
Zurzeit prüfe ich die Einführung der digitalen Signierung von z.B. Rechnungen in unserem Haus. Die Kollegen haben alle den Adobe Reader XI installiert.
Auf meinem Rechner ist der Adobe Acrobat Standard 8 installiert. Ich habe nun ein digitales Zertifikat beschafft mit welchem man PDF Dateien signieren kann.
Dies funktioniert auf meinem Rechner mit dem Acrobat 8 auch einwandfrei (blaue Leiste oberhalb der PDF wird korrekt angezeigt...).
Problem - wie kann ich dies auch mit dem Adobe Reader realisieren?
Im Adobe Reader gibt es ja die Option "Signieren / Arbeiten mit Zertifikaten". Leider ist diese Option bei egal welcher PDF Datei ausgegraut.
Ich habe auch schon das entsprechende Zertifikat auf dem Rechner installiert und im Adobe Reader hinterlegt - ohne Erfolg.
Wie bekomme ich es also hin, eine PDF Datei welche bei uns, z.B. durch einen Cute PDF Writer oder eine Serverkomponente erzeugt wird, digital zu signieren?
Danke für eure Hilfe!
Gruß

Danke für die Info!
Nun aber zum nächsten Problem
Ich habe mir nun einen Adobe Reader Prof. genommen eine Test PDF Datei erstellt (Cute PDF Writer) und habe die entsprechende Option "Funktionen in Adobe Reader erweitern" aktiviert. Daraufhin das Dokument gespeichert.
Als nächstes habe ich die PDF Datei auf einen Testrechner mit Adobe Reader XI kopiert und die Datei dort geöffnet - es erscheint:
Was mache ich falsch bzw. was muss ich ändern, damit diese Meldung nicht kommt und ich die Datei signieren kann?
Danke

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From: Test Screen Name [email protected]
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To: gunner0490
Subject: I'm not able to open PDF files in Adobe Reader XI.
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