We have a curious issue with some documents; unfortunately I can't figure out any common denominator here and ask for your help. We receive a wide variety of PDF documents from suppliers, customers and also some made internally. These have all "Signing" set to "Allowed" in the security settings for the document, but still these can't be signed in Adobe Reader (even though we can place a signature in Acrobat Pro and sign the document).
I've made these screenshots:
I hope you can answer this for me so we can move ahead.
Thanks a lot.
Vestas Towers A/S
What can you see when looking at the document properties in Adobe Reader?
In order for Reader to add a digital signature to a document, the document has to be Reader-enabled, which adds the necessary usage rights. This can be done with Acrobat or Adobe's LiveCycle Reader Extensions server-based product.