Acrobat XI : Comment empêcher qu'un PDF soit modifiable ?

Acrobat XI : Comment empêcher qu'un PDF soit modifiable ?
Je ne comprends pas qu'Adobe permette maintenant de modifier des PDF. J'émets toutes mes factures en PDF et n'ai aucunement envie que quelqu'un puisse faire des faux !

Salut Ze Red Fish ,
Utilisation d'Adobe Acrobat , vous pouvez appliquer une sécurité par mot de passe et peut rendre les documents sécurisés . Se il vous plaît se référer à l'URL ci-dessous mentionné pour l'IS
http://www.adobe.com/content/dam/Adobe/en/products/acrobat/pdfs/adobe-acrobat-xi-protect-p df-file-with-permissions-tutor…
Thanks
Vikrantt Singh

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