Photoshop Help Saving PDF files - Adobe Systems

For advanced users, the Photoshop PDF format offers options for making the document PDF/X compliant, which is essential, for example, when you send your document to a large commercial press. PDF/X (Portable Document Format Exchange) is a subset of Adobe PDF that eliminates color, font, and trapping variables that lead to printing problems.

You can also specify security options for restricting access to the PDF document. The 128bit RC4 (Acrobat 6 and later) encryption has an option for letting users view metadata and thumbnails in a secure PDF document using Adobe Bridge.

You can save your PDF settings as a PDF preset for creating consistent Photoshop PDF files. Adobe PDF presets and settings are shared across Adobe Creative Suite components, including Photoshop, InDesign�, Illustrator�, GoLive�, and Acrobat�.