Following is a collection of presentations related to Portable Document Format.

Presentation to the PDF Universal Accessibility ISO working group January 11, 2005.

Presentation used several times discussing encryption as it relates to PDF.  This was last updated September 2005.  Discusses the following; Encryption in Acrobat, Keys and Key Strength & Public Key Cryptography.

Presentation given at the PDF East Conference in 2002 on Recognizing Corrupt and Malformed PDF files.

Two Presentations in one.  The first part of this document covers the basics of the PDF file format.  The second part discusses the parts of the Acrobat SDK.