The PalmDOC eBook file type is a version of the PDB format. pdb file extension is a database format used for the Palm OS platform. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it.
The Portable Document Format (PDF) is a file format used to present documents independent of application software, hardware, and operating systems.
Application/pdf, application/x-pdf, application/x-bzpdf, application/x-gzpdf