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With the release of Acrobat 6 (PDF 1.5), Adobe introduced the concept of the layered PDF. A layered PDF contains optional content that can be displayed or hidden by its reader. A layered PDF is a document that was originally generated by software with layer-generating capabilities. For example, AutoCAD, CorelDraw, Adobe’s In Design, Photoshop, and Microsoft’s Visio are all capable of producing layered documents or files. Users who work with such software, can separate content into layers during page composition, save their file into PDF, and retain their separated content. A layered PDF viewer such as Amyuni’s PDF Creator then detects the document’s optional content and displays it according to its visibility settings. The primary benefit of a layered PDF is its ability to contain different types of content within a single document. For example, a single software b... (more)

Injecting Intelligence into PDFs with XMP (Part 1)

What is Metadata and Why Use it? Metadata is descriptive information about data. It can be embedded into a PDF file (as XML) to help identify its contents or characteristics during its travels. Examples of metadata include: author names, document title, subject description, source type, etc. Metadata can help manage change. When businesses integrate metadata into their work flows, they can better track their document life cycles and stay ahead of document changes more effectively. However, as businesses grow and integrate metadata, they often introduce: Large amounts of unstructu... (more)

Injecting Intelligence into PDFs with XMP (Part 2)

In a previous article, we reviewed the benefits and uses of PDF metadata. Specifically, we looked at the emergence of XMP metadata as a potential standardization for metadata frameworks and at how it can help PDF developers store, exchange, track, and retrieve information. In this article we will explore the injection of custom XMP metadata tags into existing PDF/A documents. PDF/A and XMP: Inevitable Convergence In 2001, developers recognized the need to add their own customized XMP metadata tags to PDF documents. They understood that by adding their own information, they could... (more)

Android Security Issues - A By-Product of Using Open Source?

A lot of talk has been circulating lately about security issues in Android. Should anyone really be surprised to discover that an open source system is not only open to legitimate developers but also to hackers? Is it reasonable to expect that a system developed and maintained by thousands of heterogeneous developers can be relied upon to behave reasonably well under all circumstances? The concept of open source is very appealing. Highly talented developers have created tremendous products and generously shared them with the rest of us. Individual developers are not at issue her... (more)

Automating Preflight with PDF Analyzer

From Check List to PDF Options More than a decade ago Chuck Weger coined the term “preflight” to define the verification process of digital files prior to printing. Since then, this process or “check list” has materialized into integrated PDF options, plug-ins, and standalone products. Automated Batch Processing Unlike integrated options and plug-ins, PDF Analyzer can be installed on a server to perform the preflight of large numbers of documents as an automated batch process (Figure 1) without user interaction. Figure 1: Automated Preflight PDF Analyzer validates the structure ... (more)