It's possible to sign PDF documents digital with X.509 certificates. This signed documents are read only. Therefore it's possible to implement "electronic paper".
Looking for some programs similar to PortableSigner? Here are the top-recommended programs we found. Let's take a look if there's anything out there that helps you on whatever platform you're using.
PDFTK Builder is a free graphical interface to for PDFtk, making it much easier to use.
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PDF Mod is a simple application for modifying PDF documents. You can reorder, rotate, and remove pages, export images from a document, edit the title, subject...
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jPDF Tweak is a Swiss Army Knife GUI application for PDF documents: combine, split, rotate, reorder (n-up, booklet), watermark, edit bookmarks/fileinfo/pagetransition...
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