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With this chapter, we close part 3 of this book. You ve discovered that you can add different types of metadata to the documents created in parts 1 and 2. We discussed the compression of content streams, and we ll use the decompression methods in the next part to inspect the PDF syntax that s used to describe the content of a page. In the sections about encryption and digital signatures, we talked about the protection of PDF documents. You used public-key cryptography to encrypt and decrypt a PDF document, and to digitally sign a PDF document. You ve worked with key stores and certificates, signing documents in different ways. You ve also learned about certificate and timestamp authorities, about certificate revocation lists, and the Online Certificate Status Protocol. This chapter completes the overview of essential iText skills you may need when creating or manipulating PDF documents. In the next part, we ll dive into the PDF specification, and look at PDF at a much lower level. While doing this, you ll learn about different types of PDFs such as PDF/X and PDF/A. We ll work with PDF-specific functionality, such as optional content and marked content, and we ll inspect different types of streams.

officially received This speed degradation is likely to be unacceptable in applications that are streaming audio or video content Since UDP does not provide guarantees of packet delivery or packet receiving order, the headers and metadata required are simpler than a reliable protocol such as TCP Therefore, datagrams are most useful when speed of delivery is crucial In the J2ME environment, datagrams can be useful due to their simplicity as a lighter weight data transport alternative to TCP For example, datagrams might be useful when beaming data over an Ir port between two devices Another feature of datagrams is that the programmer controls the packet size of the transmission If you want to send a large amount of data in a single packet, you can (up to 64kB) If you want to send a single byte in a packet, you can.

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art 4 provides an overview of the history of PDF, and it shows you the inner workings of a PDF document. It explains the different parts of a PDF file: the header, the body, the cross-reference table, and the trailer. The body of a PDF file consists of a series of objects, and you ll learn about the different types of objects in the Carousel Object System. The three final chapters focus on stream objects. First you ll learn more about the content stream of a page. You ll learn about graphics state and text state, and about marked content. In the final chapter, you ll learn how to deal with streams that contain images, fonts, file attachments, and rich media.

When you click an image in Word, the Picture toolbar appears, as shown in Figure 3-12. It provides a number of options for editing your picture, such as adjusting brightness, contrast, and color. You can also crop images or rotate them.

One of the initial strengths that made iText a success was that a developer was and still is able to create documents in the PDF format without having to know anything about the PDF specification. In the first versions of iText, you only had to know how a Chunk related to a Phrase, a Phrase to a Paragraph, and so on. The functionality was simple, but rather limited. Features that are specific to PDF, such as forms, optional content, and file attachments, weren t supported yet. The more functionality was added, the more there was a need for developers to understand what PDF is about. That s why we re going to take a look inside. But before you open up a PDF file, let s look at why PDF was invented and how the format evolved from a de facto to an ISO standard.

Handling datagram unreliability Although UDP datagrams do not inherently provide guaranteed delivery and packet reordering, you can implement this at the application level For example, a client that sends a datagram and does not receive a response for a specified period of time could assume the packet was not received and try to resend the information or indicate an error Furthermore, the data encapsulated by the datagram could include tags indicating how to reassemble the data on the receiving side For example, if the first packet received contains the information packet 4 of 7 the receiver would understand it needs 7 packets in all before attempting to order the data If less than 7 packets are received and a certain amount of time passed without receiving another packet, the receiver could ask the sender to resend the missing packets.

We can t talk about the history of PDF without talking about the history of the inventors of PDF, Adobe Systems Incorporated. Adobe was founded in 1982 by John Warnock and Chuck Geschke. Its first products were digital fonts, but nowadays Adobe offers a wide range of products and technologies. In this section, we ll look at the ancestors of PDF, and you ll learn about the different types of PDF that were created for different purposes.

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