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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF file may be encrypted, for security, in which case a password is needed to view or edit the contents. 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.

3. PDF/A - Wikipedia

   en.wikipedia.org/wiki/PDF/A

   PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...

4. Xpdf - Wikipedia

   en.wikipedia.org/wiki/Xpdf

   Xpdf can decode LZW and read encrypted PDFs. The official version obeys the DRM restrictions of PDF files, [7] which can prevent copying, printing, or converting some PDF files. [4] There are patches that make Xpdf ignore these DRM restrictions; [8] the Debian distribution, for example, has these patches in place by default. [9]

5. Javelin PDF Reader - Wikipedia

   en.wikipedia.org/wiki/Javelin_PDF_Reader

   Javelin PDF Reader is a full functionality secure PDF reader for Windows, macOS, iOS/iPadOS (iPad and iPhone) and Android, with support for Digital Rights Management (DRM) using encoded and encrypted PDF files in Drumlin's DRMX and DRMZ formats. PDF files that have been converted to the DRMX and DRMZ formats (using the free DrumlinPublisher ...

6. Cryptee - Wikipedia

   en.wikipedia.org/wiki/Cryptee

   Cryptee is a privacy focused client-side encrypted and cross-platform productivity suite and data storage service.Users can write personal documents, notes, journals, store images, videos, and various kinds of other files.

7. Microsoft Office password protection - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Office_password...

   Hacking software is now readily available to find a 16-byte key and decrypt the password-protected document. [5] Office 97, 2000, XP and 2003 use RC4 with 40 bits. [4] The implementation contains multiple vulnerabilities rendering it insecure. [5] In Office XP and 2003 an opportunity to use a custom protection algorithm was added. [4]