Use this free plug-in to digitally sign PDF documents with VeriSign Digital IDs so that the recipient may verify that the document originated from the signer and has not been altered either intentionally or accidentally since it was signed.
The VeriSign Document Signer Plug-in v2.0 for Adobe® Acrobat® 4.0, 5.0, and Adobe® Acrobat Reader 5.1, enables you to digitally sign Acrobat PDF documents using a VeriSign Digital ID. A digital signature is to an electronic document what a handwritten signature is to a paper document. The digital signature is an unforgeable piece of data that asserts that the named person wrote, or otherwise agreed to, the document to which the signature is attached.
A digital signature actually provides a greater degree of security than a handwritten signature. The recipient of a digitally signed document can verify both that the document originated from the person whose signature is attached and that the document has not been altered either intentionally or accidentally since it was signed. Furthermore, secure digital signatures cannot be repudiated-that is, the signer of a document cannot later disown it by claiming the signature was forged.
Digital signatures enable "authentication" of digital documents, assuring the recipient of a digital document of both the identity of the sender and the integrity of the document.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.