Abstract: in view of the current copyright management the field of demand, put forward PDF documents copyright protection solution based on network. In the system, using A new machine based on fingerprint of the copyright protection method, PDF document content high strength of the symmetric key encryption algorithm, finally got PDF document content encryption protection,

PDF is a perfect file format for reading and sharing. It's compatible widely, you can view PDF in any computer of different operating system, just with a free PDF reader; it's reliable, anyone cannot edit or change the content in a PDF file that protected by password. So, PDF becomes more and more world widely accepted and used. Many writers use PDF to publish their works and sell them on the internet ; the job application online is usually published in PDF format so that all applicants cannot revise the standard application format. Adobe PDF file is so widely used in our daily study and work. Lots of official or commercial or private documents have been created in form of PDF files. As it has a decent feature of unlimited sharing as long as you have installed a free adobe reader.

The Word file format is extensively used for the purpose of word processing like editing article or preparing reports and other documents. But people may want to make the Word file more portable and secure to transmit and appears exactly as the original on the recipients' screens, for example, for delivery of confidential business contract or creating an e-Book. In these cases, people may choose to convert Word to PDF format which transcends all technological barriers. You can even encrypt the PDF files so that no alterations by unauthorized parties are possible. Subsequently, the problem about how to convert Word to PDF format may confuse you. Which tool can you turn to?

Since always, Adobe every product is high above, constantly news is coming first April Adobe TV, today is the best way to both, one is Adobe on-line collaborative office honor online, named Acrobat, the official foreign open beta; it is officially launched Acrobat 9 which the main desktop version has the significant improvements.

What differentiation do Adobe Reader and Adobe Acrobat have?

Why do you need to convert Word to PDF? Microsoft Word is the most popular and easy tool for document creation. However PDF is de facto the standard for the document interchange over the Internet. If you need to convert your Word to PDF on the desktop, you can use Adobe Professional or one of many plug-ins for Microsoft Word. Also you can use our free desktop tool Xml2PDF Workstation for converting Word to PDF. However neither Word nor Adobe Professional is suitable for server use. And if you need to convert Word to PDF automatically on your server or if you need your application to be able to do this conversion, the Xml2PDF Commander or Server (.NET API) is your savior.

Adobe Reader and Adobe Acrobat are two different products, they can seamless to cooperation. Use Adobe Reader can view, search, verification and print Adobe PDF files, it can also create Adobe PDF files with digital signature for its cooperation. Use Adobe Acrobat can start work process, and can create, merger, collect and control Adobe PDF file contains information, and in the light of this information to expand cooperation. This document through signing certificate, it can guarantee that the authenticity, integrity and effectiveness of important document, including file integrity, the copyright. In addition, still have time stamp, can let us understand the time of each update document version. Because PDF documents are more and more be used between the enterprise and government, so the necessary digital signature is very important, and we can see, PDF documents in many countries and areas, has been widely used health care industry, manufacturing and design industry, education, government, financial services, notarization and legal service, the authentication and delegate, etc. but in many cases, we often need to convert PDF to word mac free ox, we can use the PDF converter for mac software.

So, if we can use Adobe Reader to edit PDF files?

The answer is no. You can not use to PDF file Adobe Reader for permanent change. But in the PDF documents it enables much similar editing function; you can use Adobe Reader carry out these functions. For example, you can highlight text; still can be in electronic note with notation. If you expect to create and exchanging documents, collection and compared in order to distribute the reliable notation and modify the Adobe PDF documents, please consider using mac PDF converter to realize your needs.

PDF is Posts crypt technology as the foundation of the document format, rather than page description language (des creation brief language), it has removed the uncertainty that may occur when compiling. It can convert any page to PDF document that generated by all software. completely embedding the text, graphics, image links of the original document into PDF document. You can choose the text page to be embedded to PDF when conversion. even if a Chinese PDF documents are also available in Chinese font not installed the pure English system of the right, the real to open print text exchange network without borders. PDF also can be converted into containing the font EPS (Encapsulated Posts cript), PDF is compatible document text image data, or independently in various computer platforms and applications of high compatibility document format, can use all sorts of platform PDF documents between generic Binary (Binary) or ASCII coding, realize the real cross-platform homework, it can convey to almost any platform.

PDF is ISO international standard open format, so in many countries and regions, it has become the mainstream of electronic document formats. For example: people bought a iPhone4 in Hong Kong may have personal experience, a lot of apple store has already started to do not provide entity invoice, but the PDF electronic invoice. In order to better understand the PDF files, the PDF files can be divided into four parts. The first part is the object; the PDF is a group of basic object types. Most of these types of language use and Posts crypt corresponding data types. PDF support a lot of basic data types: Boolean type, number, string literal, name, arrays, dictionary and flow, another is empty object. In PDF file, often give some object gives a label for other object call, this label object is called indirect object.

Although it had a great success, the PDF file format has one important drawback. It is a What You See Is What You Get (WYSIWYG) format. This means that it cannot be altered from what you see on the computer screen. To alter it, you will need the original password. Why is this? Well, the PDF file format is basically just a snapshot, or a graphic portrayal of text. Although you might think of it as text, it is not. This "drawback" is perfect for a company that wants to send information like annual reports without having to worry about someone editing the PDF file. However, this is not too great for people who need to copy and paste a part of the PDF into a Word document or еdit the PDF in any way.