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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Printing system can render any document to a PDF file, thus any Linux program with print capability can produce PDF files Pdftk: GPLv2: No Yes Yes Command-line tools to merge, split, en-/decrypt, watermark/stamp and manipulate PDF document files. Front end to an older version of the iText library. poppler: GNU GPL: Yes Yes

3. Let's Encrypt - Wikipedia

   en.wikipedia.org/wiki/Let's_Encrypt

   Let's Encrypt is a non-profit certificate authority run by Internet Security Research Group (ISRG) that provides X.509 certificates for Transport Layer Security (TLS) encryption at no charge. It is the world's largest certificate authority, [3] used by more than 400 million websites, [4] with the goal of all websites being secure and using HTTPS.

4. List of virtual printer software - Wikipedia

   en.wikipedia.org/wiki/List_of_virtual_printer...

   The following are distributed under free software licences: CC PDF Converter (discontinued) – A Ghostscript-based virtual printer. clawPDF – An open source virtual PDF/OCR/Image Printer with network sharing and ARM64 support [1]. cups-pdf – An open source Ghostscript-based virtual printer that can be shared with Windows users over the LAN ...

5. List of free and open-source software packages - Wikipedia

   en.wikipedia.org/wiki/List_of_free_and_open...

   This is a list of free and open-source software (FOSS) packages, computer software licensed under free software licenses and open-source licenses.Software that fits the Free Software Definition may be more appropriately called free software; the GNU project in particular objects to their works being referred to as open-source. [1]

6. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   An owner password can easily be removed by software, including some free online services. [34] Thus, the use restrictions that a document author places on a PDF document are not secure, and cannot be assured once the file is distributed; this warning is displayed when applying such restrictions using Adobe Acrobat software to create or edit PDF ...

7. Self-signed certificate - Wikipedia

   en.wikipedia.org/wiki/Self-signed_certificate

   Special treatment of X.509 certificate fields for self-signed certificate can be found in RFC 3280. [1] Revocation of self-signed certificates differs from CA-signed certificates. By nature, no entity (CA or others) can revoke a self-signed certificate. But one could invalidate a self-signed CA by removing it from the trust whitelist. [3]