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".
Are you trying to find the best programs like PortableSigner? Have a look at this post and weigh in on your thoughts. Cool!
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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Use DottedSign to complete your work, including NDAs, sales contracts, lease agreements, permission slips, financial agreements, and more. Just import your 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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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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Adobe Fill & Sign lets you fill, sign, and send any form fast. You can even snap a picture of a paper form and fill it in on your phone or tablet. Then e-sign and...
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DigiSigner is a small but hot looking PDF viewer and signer tool. Secure your PDFs with DigiSigner. Create nice looking signatures with DigiSigner. Make your...
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