In Part I, I discussed that fact that PDF documents are page-based rather than document-based . The benefits of this become clear in Part II, as I demonstrate how PDF documents can be manipulated. PDFs can be viewed , printed, and published or transferred electronically ; they can be used col-laboratively, as presentations, as forms, or as full-featured e-books. And for those with security needs, Acrobat provides a full set of security features, including encrypted digital signatures.