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                                                 32
      CHAPTER 1                                                                  Introduction



      PDF and PostScript support several standard formats for font programs, includ-
      ing Adobe Type 1, CFF (Compact Font Format), TrueType, OpenType and CID-
      keyed fonts. The PDF manifestations of these fonts are documented in this book.
      However, the specifications for the font files themselves are published separately,
      because they are highly specialized and are of interest to a different user commu-
      nity. A variety of Adobe publications are available on the subject of font formats.
      The Bibliography lists these publications, as well as additional documents related
      to PDF and the contents of this book.


1.4 Intellectual Property

      Adobe owns copyrights in the PDF Reference. Adobe will enforce its copyrights.
      One reason Adobe must retain its copyrights in the PDF Reference is to maintain
      the integrity of the Portable Document Format standard and ensure that the pub-
      lic can distinguish between the Portable Document Format and other interchange
      formats for electronic documents. Nonetheless, Adobe desires to promote the use
      of the Portable Document Format for information interchange among diverse
      products and applications. Accordingly, Adobe gives permission to everyone un-
      der its copyrights to copy, modify, and distribute any example code in the written
      specification, to the extent necessary to implement the Portable Document For-
      mat in a manner compliant with the PDF Reference.1

      Adobe Systems Incorporated and its subsidiaries own a number of patents cover-
      ing technology disclosed in the PDF Reference. Nothing in the PDF Reference it-
      self grants rights under any patent. Nonetheless, Adobe desires to encourage
      implementation of the PDF computer file format on a wide variety of devices and
      platforms, and for this reason offers certain royalty-free patent licenses to PDF
      implementors worldwide. To review those licenses, please visit
      http://www.adobe.com/go/developer_legalnotices.




1.This example code includes, but is not limited to, the copyrighted list of data structures, opera-
tors, and PostScript language function definitions, that were referenced in PDF Reference, fifth
edition, version 1.6, Section 1.5 (Intellectual Property).

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