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".
When deciding on the best PortableSigner alternative, consider these alternatives. Check out these other software with a similar interface and features as well.
Adobe Acrobat is a family of application software and web services developed by Adobe Systems to view, create, manipulate, print and manage files in Portable Document...
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PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
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PDFTK Builder is a free graphical interface to for PDFtk, making it much easier to use.
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Nitro Pro gives you everything you need to create, convert, edit, sign, and share 100% industry-standard PDF files. It's simple, straightforward, and intuitive to...
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Create, Convert, Review and Edit PDF Documents on Windows, Mac OS X, and Linux. PDF Studio is an all-in-one, easy to use PDF editor that provides all PDF features...
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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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