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You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
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
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]
That is, software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy. Typically, this means software which is distributed with a free software license, and whose source code is available to anyone who receives a copy of the software. Free and open-source software portal
PDF24 Creator is an application software by Geek Software GmbH for the creation of PDF files from any application and for converting files to the PDF format. The application is released under a proprietary freeware license.
Acrobat Distiller Server is a discontinued server-based utility that was developed by Adobe Systems to perform centralized high-volume conversion of PostScript documents to PDF formats for workgroups. Acrobat eBook Reader is a PDF-based e-book reader from Adobe Systems. Features present in Acrobat eBook Reader later appeared in Digital Editions.
Poppler is a free and open-source software library for rendering Portable Document Format (PDF) documents. Its development is supported by freedesktop.org . Commonly used on Linux systems, [ 4 ] it powers the PDF viewers of the GNOME and KDE desktop environments .
PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.