An electronic signature is any legally recognized electronic means that indicates that a person adopts the contents of an electronic message. There are a number of way in which we can add electronic signature to Adobe PDF document.
Signature Stamp
Stamp signature is a very basic electronic signature. Stamp signatures can be manipulated, duplicated or deleted unless the document is ‘flattened,’ but it’s one way to get started. Stamp signature is not going to lock the document nor notify the recipient if something has been changed in the document. These signature can be printed or emailed. Stamp signature is somewhat like the plain ink signature. Acrobat 9 can be used to add handwriting like signature in PDF documents.
A dedicated signature pad or software can be used to capture and add your signature into the PDF document. This can lock the documents and notify the recipient if something has been changed in the document.
Digital Signature
Digital signatures are more secure as compare to other electronic signature. A document signed with proper digital signature gives the receiver reason to believe the message was sent by the claimed sender. Acrobat’s self-signed’ digital IDs feature can be used to create digital signature. How ever these signature do not offer the recipient any proof of the signer’s identity…the signer is vouching for his or her self but self signed digital signatures are good for personal use.
“Certificate Authorities” also provide digital ID’s but these id’s are not free. Authorize digital ID offers many other benefits also like automatic trust in Acrobat and Reader, and embedding of secure time and validation information. Third party “Certificate Authorities” validate your identity and provide better assurance as to your digital signature.
You can also do this without Acrobat, for free, at #1 rated EchoSign.com
http://www.echosign.com
An alternative of Adobe Acrobat is PDF Sign&Seal which provides more flexiblity and features when it comes to add a digital signature by providing flexible signature appearance designer, able to create longterm digital or certified digital signature. You can have more information from:
http://www.ehow.com/how_5221043_digital-pdf-using-pdf-signseal.html
OR
http://www.ascertia.com/Products/pdfsignseal/Default.aspx?m=menudocsign&s=pdfss
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You can read more about how PDF Sign & Seal could be used to add PDF digital signatures: http://www.ascertia.com/Support/blogs/PDF_Signatures_Explained.aspx
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Hi, take a look at DigiSigner under http://www.digisigner.com. It is free and very user friendly tool to sign PDFs using standard X.509 certificates. It produces real digital signatures that secure your documents and not just embeds pictures in your PDFs. You can download it right away without any registration for Windows, Mac or Linux from http://www.digisigner.com/downloads.html.