This document provides an overview of the PDF CMD SDK which allows developers to:
1. Convert documents to PDF format and control conversion settings such as security, compression, and font embedding through interfaces like IPDFCreate.
2. Combine multiple PDF documents into a single file using the IPDFCombineInterface.
3. Package files into a password protected PDF portfolio using the IPDFPackageInterface.
4. Edit existing PDF files by opening, creating new files, and saving through the IPDFFileEdit interface.
The SDK allows developers to programmatically generate, secure, combine and edit PDF files through its various interfaces.