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For example, Adobe Systems grants permissions to enable additional features in Adobe Reader, using public-key cryptography. Adobe Reader verifies that the signature uses a certificate from an Adobe-authorized certificate authority. Any PDF application can use this same mechanism for its own purposes. [37]
The first widely marketed software package to offer digital signature was Lotus Notes 1.0, released in 1989, which used the RSA algorithm. [26] Other digital signature schemes were soon developed after RSA, the earliest being Lamport signatures, [27] Merkle signatures (also known as "Merkle trees" or simply "Hash trees"), [28] and Rabin ...
As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed. PagePlus: Proprietary: No
Features present in Acrobat eBook Reader later appeared in Digital Editions. Acrobat Elements was a very basic version of the Acrobat family that was released by Adobe Systems. Its key feature advantage over the free Acrobat Reader was the ability to create reliable PDF files from Microsoft Office applications. [34]
Adobe Sign is sold in subscriptions at the individual, small business, or enterprise level. [10] Some of the services available are: Sign forms with an electronic signature or digital signature; Request e-signatures; Create branded forms; Track responses, get email notifications, and send reminders for e-signatures [11]
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Adobe distributed its Adobe Reader (now Acrobat Reader) program free of charge from version 2.0 onwards, [6] and continued supporting the original PDF, which eventually became the de facto standard for fixed-format electronic documents. [7] In 2008 Adobe Systems' PDF Reference 1.7 became ISO 32000:1:2008.
Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]