These properies are optional so you can leave them blak if you don't need them. When you create a PDF file a Save As window opens that enables you to select not only the name and location of the newly created PDF file but also three groups of additional properties:

Description
- Title
- Author
- Subject
- Keywords
Security
- Set User Password
- Set Owner Password
- Allow Content Copying and Extraction
- Allow Form Filling, Signing and Commenting
- Allow Changing the Document
- Allow Printing
- Set Encryption Level to Low or High
Advanced
- Select PDF Page Layout: You can set it to Single Page, Continuous, Facing or Continuous Facing.
- Select PDF Page Mode: You can set it to Normal, Outlines, Thumbnails or Full Screen.
- Document Compression: You can select between No compression and the Flate algorithm.
- PDF Images Compression: You can select among the Flate algorythm, JPEG, CCITT3, CCITT32d and CCITT4
- JPEG Quality: Set the quality of the JPEG images in the PDF
- PDF Version: You can select between v1.3 (Acrobat 4) and v1.4 (Acrobat 5)
- Alternate EMF Rendering