Securing and signing PDF documents

This article describes how digital signatures are represented in a PDF document using Aspose.PDF for PHP via Java.

Digital signatures can be used for many types of documents where traditional pen-and-ink signatures were used in the past. However, the mere existence of a digital signature is not adequate assurance that a document is what it appears to be. Moreover, government and enterprise settings often need to impose additional constraints on their signature workflows, such as restricting user choices and document behavior during and after signing.

• Digitally sign PDF file