PDF (English Wikipedia)

Mladenov, Vladislav; Mainka, Christian; Meyer Zu Selhausen, Karsten; Grothe, Martin; Schwenk, Jörg (November 6, 2019). "1 Trillion Dollar Refund: How to Spoof PDF Signatures". Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security. CCS '19. ACM Digital Library, ACM SIGSAC Conference on Computer and Communications Security. pp. 1–14. doi:10.1145/3319535.3339812. ISBN 9781450367479. S2CID 199367545. Archived from the original on April 26, 2021. Retrieved April 6, 2021.
Müller, Jens; Ising, Fabian; Mladenov, Vladislav; Mainka, Christian; Schinzel, Sebastian; Schwenk, Jörg (November 6, 2019). "Practical Decryption exFiltration: Breaking PDF Encryption". Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security. CCS '19. ACM Digital Library, ACM SIGSAC Conference on Computer and Communications Security. pp. 15–29. doi:10.1145/3319535.3354214. ISBN 9781450367479. S2CID 207959243. Archived from the original on April 26, 2021. Retrieved April 6, 2021.

adobe.com (Global: 1,631^st place; English: 1,239^th place)

adobe.com

Adobe Systems Incorporated (November 2006). "PDF Reference" (PDF). 1.7 (6th ed.). Archived from the original (PDF) on October 1, 2008. Retrieved January 12, 2023.
"What is a PDF? Portable Document Format | Adobe Acrobat DC". Adobe Systems Inc. Archived from the original on January 30, 2023. Retrieved January 12, 2023.
"Public Patent License, ISO 32000-1: 2008 – PDF 1.7" (PDF). Adobe Systems Inc. 2008. Archived (PDF) from the original on June 18, 2009. Retrieved January 12, 2023.
"PostScript Language Reference" (PDF). Archived from the original (PDF) on July 24, 2021.
"3D supported formats". Adobe Systems Inc. July 14, 2009. Archived from the original on February 12, 2010. Retrieved February 21, 2010.
"JavaScript for Acrobat 3D | Adobe Acrobat Developer Center". Adobe Systems Inc. Archived from the original on November 12, 2009. Retrieved January 12, 2023.
"Adobe Developer Connection: PDF Reference and Adobe Extensions to the PDF Specification". Adobe Systems Inc. Archived from the original on November 15, 2006. Retrieved December 13, 2010.
"PDF Blend Modes Addendum" (PDF). Archived from the original (PDF) on October 14, 2011. Retrieved January 12, 2023.
Adobe Systems Inc. (July 1, 2008). "Document Management – Portable Document Format – Part 1: PDF 1.7, First Edition" (PDF). Archived from the original (PDF) on December 3, 2008. Retrieved January 12, 2023.
"Accessing PDF documents with assistive technology: A screen reader user's guide" (PDF). Adobe Systems Inc. Archived from the original (PDF) on July 28, 2008. Retrieved January 12, 2023.
"FDF Data Exchange Specification" (PDF). February 8, 2007. Archived from the original (PDF) on December 3, 2008. Retrieved January 12, 2023.
"Can PDFs have viruses? Keep your files safe". Adobe. Archived from the original on October 4, 2023. Retrieved October 3, 2023.
"Adobe PDF Print Engine". Adobe Systems Inc. Archived from the original on August 22, 2013. Retrieved August 20, 2014.

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"Supported file formats in Acrobat and Reader". Adobe Systems Inc. November 11, 2022. Archived from the original on December 21, 2022. Retrieved January 12, 2023.
"Links and attachments in PDFs". Archived from the original on April 23, 2021. Retrieved April 23, 2021.
Adobe Systems Incorporated (September 20, 2022). "Using Acrobat forms and form data on the web". Archived from the original on January 12, 2023. Retrieved January 12, 2023.
"Security bulletins and advisories". Adobe Systems Inc. January 10, 2023. Archived from the original on April 6, 2010. Retrieved January 12, 2023.

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"Migrating from Adobe Acrobat forms to XML forms". Archived from the original on October 6, 2010. Retrieved January 12, 2023.
"Developer Resources". Adobe Systems Inc. Archived from the original on February 27, 2016.

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"ISO 32000-1:2008" (PDF). Archived from the original (PDF) on July 26, 2018.

livedocs.adobe.com

"About PDF forms". Adobe Systems Inc. Archived from the original on April 29, 2011. Retrieved February 19, 2010.

community.adobe.com

Demling, Peter (July 1, 2008). "Convert XFA Form to AcroForm?". Archived from the original on January 12, 2023. Retrieved January 12, 2023.

forums.adobe.com

Adobe Forums, Announcement: PDF Attachment Virus "Peachy" Archived September 4, 2015, at the Wayback Machine, August 15, 2001.

adobepress.com (Global: low place; English: low place)

"Getting Familiar with Adobe Reader > Understanding Preferences". Adobe Press. Pearson. September 2, 2005. Archived from the original on October 23, 2012. Retrieved January 12, 2023.

alistapart.com (Global: low place; English: low place)

Clark, Joe (August 22, 2005). "Facts and Opinions About PDF Accessibility". Archived from the original on January 24, 2013. Retrieved January 12, 2023.

apache.org (Global: 3,206^th place; English: 2,477^th place)

pdfbox.apache.org

"The Apache PDFBox project- Apache PDFBox 3.0.0 released". August 17, 2023. Archived from the original on January 7, 2023. Updated for new releases.

apple.com (Global: 67^th place; English: 64^th place)

support.apple.com

"View PDFs and images in Preview on Mac". Apple Support. Retrieved July 16, 2025.
"See a PDF in Safari on Mac". Apple Support. Retrieved July 16, 2025.

archive.today (Global: 14^th place; English: 14^th place)

"Xpdf License". Archived from the original on April 14, 2013. Retrieved January 12, 2023. Xpdf is licensed under the GNU General Public License (GPL), version 2 or 3.

arxiv.org (Global: 69^th place; English: 59^th place)

Meuschke, Norman; Jagdale, Apurva; Spinde, Timo; Mitrović, Jelena; Gipp, Bela (2023), Sserwanga, Isaac; Goulding, Anne; Moulaison-Sandy, Heather; Du, Jia Tina (eds.), "A Benchmark of PDF Information Extraction Tools Using a Multi-task and Multi-domain Evaluation Framework for Academic Documents", Information for a Better World: Normality, Virtuality, Physicality, Inclusivity, vol. 13972, Cham: Springer Nature Switzerland, pp. 383–405, arXiv:2303.09957, doi:10.1007/978-3-031-28032-0_31, ISBN 978-3-031-28031-3

bbc.co.uk (Global: 8^th place; English: 10^th place)

"PDF Accessibility Standards". 1.2. BBC. Archived from the original on May 29, 2010. Retrieved January 12, 2023.

blackhat.com (Global: low place; English: low place)

"Portable Document Flaws 101". Blackhat. Archived from the original on April 9, 2021. Retrieved April 6, 2021.

cgit.freedesktop.org (Global: low place; English: low place)

"Xpdf License". Archived from the original on April 14, 2013. Retrieved January 12, 2023. Xpdf is licensed under the GNU General Public License (GPL), version 2 or 3.

cmu.edu (Global: 1,564^th place; English: 1,028^th place)

cs.cmu.edu

Guignard, Bryan. "How secure is PDF" (PDF). Carnegie Mellon University. Archived from the original (PDF) on October 24, 2005.

csus.edu (Global: low place; English: low place)

"PDF Accessibility" (PDF). California State University. 2009. Archived from the original (PDF) on May 27, 2010. Retrieved January 12, 2023.

doi.org (Global: 2^nd place; English: 2^nd place)

Hardy, M.; Masinter, L.; Markovic, D.; Johnson, D.; Bailey, M. (March 2017). The application/pdf Media Type. IETF. doi:10.17487/RFC8118. RFC 8118.
"Embedding and publishing interactive, 3-dimensional, scientific figures in Portable Document Format (PDF) files". PLOS ONE. 8 (9). 2013. doi:10.1371/journal.pone.0069446.s001. the implementation of the U3D standard was not complete and proprietary extensions were used.
Mladenov, Vladislav; Mainka, Christian; Meyer Zu Selhausen, Karsten; Grothe, Martin; Schwenk, Jörg (November 6, 2019). "1 Trillion Dollar Refund: How to Spoof PDF Signatures". Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security. CCS '19. ACM Digital Library, ACM SIGSAC Conference on Computer and Communications Security. pp. 1–14. doi:10.1145/3319535.3339812. ISBN 9781450367479. S2CID 199367545. Archived from the original on April 26, 2021. Retrieved April 6, 2021.
Müller, Jens; Ising, Fabian; Mladenov, Vladislav; Mainka, Christian; Schinzel, Sebastian; Schwenk, Jörg (November 6, 2019). "Practical Decryption exFiltration: Breaking PDF Encryption". Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security. CCS '19. ACM Digital Library, ACM SIGSAC Conference on Computer and Communications Security. pp. 15–29. doi:10.1145/3319535.3354214. ISBN 9781450367479. S2CID 207959243. Archived from the original on April 26, 2021. Retrieved April 6, 2021.
Meuschke, Norman; Jagdale, Apurva; Spinde, Timo; Mitrović, Jelena; Gipp, Bela (2023), Sserwanga, Isaac; Goulding, Anne; Moulaison-Sandy, Heather; Du, Jia Tina (eds.), "A Benchmark of PDF Information Extraction Tools Using a Multi-task and Multi-domain Evaluation Framework for Academic Documents", Information for a Better World: Normality, Virtuality, Physicality, Inclusivity, vol. 13972, Cham: Springer Nature Switzerland, pp. 383–405, arXiv:2303.09957, doi:10.1007/978-3-031-28032-0_31, ISBN 978-3-031-28031-3

editme.com (Global: low place; English: low place)

pdf.editme.com

"ISO/TC 171/SC 2/WG 8 N 603 – Meeting Report" (PDF). Edit me. June 27, 2011. Archived from the original (PDF) on November 26, 2012 – via Archive. XFA is not to be ISO standard just yet. The Committee urges Adobe Systems to submit the XFA Specification, XML Forms Architecture (XFA), to ISO for standardization The Committee is concerned about the stability of the XFA specification Part 2 will reference XFA 3.1

etsi.org (Global: 7,368^th place; English: 6,009^th place)

"ETSI TS 102 778-1 - Electronic Signatures and Infrastructures (ESI); PDF Advanced Electronic Signature Profiles; Part 1: PAdES Overview - a framework document for PAdES" (PDF). 1.1.1. European Telecommunications Standards Institute ETSI. July 2009. Archived (PDF) from the original on March 8, 2023. Retrieved January 12, 2023.

europa.eu (Global: 68^th place; English: 117^th place)

eur-lex.europa.eu

"Guide for the procurement of standards-based ICT – Elements of Good Practice, Against lock-in: building open ICT systems by making better use of standards in public procurement". European Commission. June 25, 2013. Archived from the original on September 19, 2020. Retrieved January 12, 2023. Example: ISO/IEC 29500, ISO/IEC 26300 and ISO 32000 for document formats reference information that is not accessible by all parties (references to proprietary technology and brand names, incomplete scope or dead web links).

freemypdf.com (Global: low place; English: low place)

"FreeMyPDF.com – Removes passwords from viewable PDFs". freemypdf.com. Archived from the original on February 20, 2021. Retrieved June 23, 2009.

fsf.org (Global: 8,472^nd place; English: 7,926^th place)

On 2014-04-02, a note dated February 10, 2009 referred to Current FSF High Priority Free Software Projects Archived August 10, 2007, at the Wayback Machine as a source. Content of the latter page, however, changes over time.
Lee, Matt (October 6, 2011). "GNU PDF project leaves FSF High Priority Projects list; mission complete!". fsf.org. Free Software Foundation. Archived from the original on December 28, 2014.

github.com (Global: 383^rd place; English: 320^th place)

"Streaming filter decompression · Issue #3429 · py-pdf/pypdf". GitHub. August 11, 2025. Retrieved August 16, 2025.

globalgraphics.com (Global: low place; English: low place)

"Jaws® 3.0 PDF and PostScript RIP SDK". globalgraphics.com. Archived from the original on March 5, 2016. Retrieved November 26, 2010.
"Harlequin MultiRIP". Archived from the original on February 9, 2014. Retrieved March 2, 2014.

grc.com (Global: low place; English: low place)

Gibson, Steve; Laporte, Leo (March 12, 2009). "Steve Gibson – SecurityNow Podcast". Archived from the original on May 8, 2020. Retrieved January 11, 2011.

howtogeek.com (Global: 6,527^th place; English: 4,344^th place)

Davenport, Corbin (April 11, 2025). "Why Did Web Browsers Become PDF Readers?". How-To Geek. Retrieved August 3, 2025.

ietf.org (Global: 214^th place; English: 176^th place)

datatracker.ietf.org

Hardy, M.; Masinter, L.; Markovic, D.; Johnson, D.; Bailey, M. (March 2017). The application/pdf Media Type. IETF. doi:10.17487/RFC8118. RFC 8118.

ijunkie.com (Global: low place; English: low place)

Pathak, Khamosh (October 7, 2017). "How to Create a PDF from Web Page on iPhone and iPad in iOS 11". iJunkie. Archived from the original on January 12, 2023. Retrieved January 12, 2023.

immagic.com (Global: low place; English: low place)

"XML Forms Data Format Specification, version 2" (PDF). September 2007. Archived from the original (PDF) on July 30, 2018. Retrieved February 19, 2010.

iso.org (Global: 629^th place; English: 610^th place)

"ISO 32000-1:2008 – Document management – Portable document format – Part 1: PDF 1.7". ISO. July 1, 2008. Archived from the original on December 6, 2010. Retrieved February 21, 2010.
"ISO 32000-2 – Document management — Portable document format — Part 2: PDF 2.0". ISO. January 5, 2021. Archived from the original on January 28, 2021. Retrieved February 3, 2021.
"ISO 32000-1:2008 Document management -- Portable document format -- Part 1: PDF 1.7". International Organization for Standardization ISO. Archived from the original on February 10, 2017. Retrieved March 22, 2016.
"ISO 19444-1:2019(en)". The International Organization for Standardization. Archived from the original on June 17, 2016. Retrieved December 3, 2020.

itextpdf.com (Global: low place; English: low place)

api.itextpdf.com

"com.itextpdf.kernel.pdf Documentation Differences". api.itextpdf.com. Retrieved June 25, 2025.

libreoffice.org (Global: low place; English: low place)

help.libreoffice.org

"LibreOffice Help – Export as PDF". Archived from the original on January 12, 2023. Retrieved January 12, 2023.

linuxfoundation.org (Global: low place; English: 8,197^th place)

"PDF as Standard Print Job Format". The Linux Foundation. Linux Foundation. October 23, 2009. Archived from the original on November 14, 2009. Retrieved January 12, 2023.

macworld.com (Global: 2,573^rd place; English: 1,594^th place)

Kirk, Jeremy (December 4, 2008). "Adobe admits new PDF password protection is weaker". Macworld. IDG Communications Inc. Archived from the original on January 17, 2017. Retrieved September 14, 2016.

microsoft.com (Global: 153^rd place; English: 151^st place)

support.microsoft.com

"Description of 2007 Microsoft Office Suite Service Pack 2 (SP2)". Microsoft. Archived from the original on April 29, 2009. Retrieved January 12, 2023.

ndss-symposium.org (Global: low place; English: low place)

"Shadow Attacks: Hiding and Replacing Content in Signed PDFs". Internet Society, The Network and Distributed System Security Symposium. Archived from the original on April 21, 2021. Retrieved April 6, 2021.
"Processing Dangerous Paths – On Security and Privacy of the Portable Document Format". Internet Society, The Network and Distributed System Security Symposium. Archived from the original on April 21, 2021. Retrieved April 6, 2021.

nist.gov (Global: 355^th place; English: 454^th place)

nvd.nist.gov

"CVE-2025-55197". NVD. Retrieved August 16, 2025.

nytimes.com (Global: 7^th place; English: 7^th place)

gadgetwise.blogs.nytimes.com

Biersdorfer, J.D. (April 10, 2009). "Tip of the Week: Adobe Reader's 'Read Aloud' Feature". The New York Times. Archived from the original on November 22, 2020. Retrieved January 12, 2023.

oooninja.com (Global: low place; English: low place)

Z., Andrew (January 11, 2008). "Exporting PDF/A for long-term archiving". Archived from the original on February 24, 2021. Retrieved September 22, 2012.

osu.edu (Global: 2,333^rd place; English: 1,632^nd place)

wac.osu.edu

"Accessibility and PDF documents". Web Accessibility Center. The Ohio State University. Archived from the original on April 27, 2010. Retrieved January 12, 2023.

parleys.com (Global: low place; English: low place)

cdn.parleys.com

Rosenthol, Leonard (2012). "PDF and Standards" (PDF). Adobe Systems. Archived from the original (PDF) on September 2, 2013. Retrieved October 20, 2013 – via Parleys.

pcmag.com (Global: 1,060^th place; English: 700^th place)

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"Malicious PDFs Execute Code Without a Vulnerability". PCMAG. Archived from the original on April 4, 2010.

pdf-insecurity.org (Global: low place; English: low place)

"PDF Insecurity Website". pdf-insecurity.org. Archived from the original on March 26, 2023. Retrieved January 12, 2023.

pdfa.org (Global: low place; English: low place)

Warnock, J. (October 14, 2004) [Original date 5 May 1995]. "The Camelot Project" (PDF). Archived (PDF) from the original on July 18, 2011.
"TC171 SC2 US WG8 PDF – PDF Association". Retrieved June 25, 2025.
"ISO 32000-2 – PDF Association". Retrieved January 27, 2025.
"Announcing no-cost access to the latest PDF standard: ISO 32000-2 (PDF 2.0)" (Press release). PDF Association. June 16, 2023 [Updated; originally published 5 April 2023]. Archived from the original on September 23, 2023. Retrieved October 6, 2023.
"ISO 32000-2:2020 is now available". PDFA. December 14, 2020. Archived from the original on December 4, 2022. Retrieved February 3, 2021.
"Tagged PDF Best Practice Guide: Syntax" (PDF). pdfa.org. PDF Association. June 2019. Retrieved June 24, 2024.
"PDF/UA in a Nutshell - Accessible documents with PDF" (PDF). pdfa.org.

pikepdf.readthedocs.io (Global: low place; English: low place)

PikePdf documentation. "Working with content streams". Archived from the original on July 5, 2022. Retrieved May 8, 2022.

poppler.freedesktop.org (Global: low place; English: low place)

"Poppler Homepage". Archived from the original on January 8, 2015. Retrieved January 12, 2023. Poppler is a PDF rendering library based on the xpdf-3.0 code base.

rfc-editor.org (Global: 6,184^th place; English: 4,465^th place)

Hardy, M.; Masinter, L.; Markovic, D.; Johnson, D.; Bailey, M. (March 2017). The application/pdf Media Type. IETF. doi:10.17487/RFC8118. RFC 8118.

semanticscholar.org (Global: 11^th place; English: 8^th place)

api.semanticscholar.org

Mladenov, Vladislav; Mainka, Christian; Meyer Zu Selhausen, Karsten; Grothe, Martin; Schwenk, Jörg (November 6, 2019). "1 Trillion Dollar Refund: How to Spoof PDF Signatures". Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security. CCS '19. ACM Digital Library, ACM SIGSAC Conference on Computer and Communications Security. pp. 1–14. doi:10.1145/3319535.3339812. ISBN 9781450367479. S2CID 199367545. Archived from the original on April 26, 2021. Retrieved April 6, 2021.
Müller, Jens; Ising, Fabian; Mladenov, Vladislav; Mainka, Christian; Schinzel, Sebastian; Schwenk, Jörg (November 6, 2019). "Practical Decryption exFiltration: Breaking PDF Encryption". Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security. CCS '19. ACM Digital Library, ACM SIGSAC Conference on Computer and Communications Security. pp. 15–29. doi:10.1145/3319535.3354214. ISBN 9781450367479. S2CID 207959243. Archived from the original on April 26, 2021. Retrieved April 6, 2021.

springer.com (Global: 274^th place; English: 309^th place)

link.springer.com

Meuschke, Norman; Jagdale, Apurva; Spinde, Timo; Mitrović, Jelena; Gipp, Bela (2023), Sserwanga, Isaac; Goulding, Anne; Moulaison-Sandy, Heather; Du, Jia Tina (eds.), "A Benchmark of PDF Information Extraction Tools Using a Multi-task and Multi-domain Evaluation Framework for Academic Documents", Information for a Better World: Normality, Virtuality, Physicality, Inclusivity, vol. 13972, Cham: Springer Nature Switzerland, pp. 383–405, arXiv:2303.09957, doi:10.1007/978-3-031-28032-0_31, ISBN 978-3-031-28031-3

talkingpdf.org (Global: low place; English: low place)

Johnson, Duff (April 22, 2004). "What is Tagged PDF?". Archived from the original on August 7, 2004.

theinquirer.net (Global: low place; English: low place)

Orion, Egan (December 5, 2007). "PDF 1.7 is approved as ISO 32000". The Inquirer. Archived from the original on December 13, 2007. Retrieved December 5, 2007.

tuwien.ac.at (Global: low place; English: low place)

complang.tuwien.ac.at

Anton Ertl, Martin. "What is the PDF format good for?". complang.tuwien.ac.at. Vienna University of Technology. Archived from the original on April 4, 2024. Retrieved April 8, 2024.

washington.edu (Global: 1,067^th place; English: 749^th place)

"Is PDF accessible?". DO-IT - Disabilities, Opportunities, Internetworking, and Technology. University of Washington. October 4, 2022. Archived from the original on February 10, 2023. Retrieved January 12, 2023.

web.archive.org (Global: 1^st place; English: 1^st place)

Adobe Systems Incorporated (November 2006). "PDF Reference" (PDF). 1.7 (6th ed.). Archived from the original (PDF) on October 1, 2008. Retrieved January 12, 2023.
Warnock, J. (October 14, 2004) [Original date 5 May 1995]. "The Camelot Project" (PDF). Archived (PDF) from the original on July 18, 2011.
"What is a PDF? Portable Document Format | Adobe Acrobat DC". Adobe Systems Inc. Archived from the original on January 30, 2023. Retrieved January 12, 2023.
"ISO 32000-1:2008" (PDF). Archived from the original (PDF) on July 26, 2018.
"ISO 32000-1:2008 – Document management – Portable document format – Part 1: PDF 1.7". ISO. July 1, 2008. Archived from the original on December 6, 2010. Retrieved February 21, 2010.
Orion, Egan (December 5, 2007). "PDF 1.7 is approved as ISO 32000". The Inquirer. Archived from the original on December 13, 2007. Retrieved December 5, 2007.
"Public Patent License, ISO 32000-1: 2008 – PDF 1.7" (PDF). Adobe Systems Inc. 2008. Archived (PDF) from the original on June 18, 2009. Retrieved January 12, 2023.
"Guide for the procurement of standards-based ICT – Elements of Good Practice, Against lock-in: building open ICT systems by making better use of standards in public procurement". European Commission. June 25, 2013. Archived from the original on September 19, 2020. Retrieved January 12, 2023. Example: ISO/IEC 29500, ISO/IEC 26300 and ISO 32000 for document formats reference information that is not accessible by all parties (references to proprietary technology and brand names, incomplete scope or dead web links).
"ISO/TC 171/SC 2/WG 8 N 603 – Meeting Report" (PDF). Edit me. June 27, 2011. Archived from the original (PDF) on November 26, 2012 – via Archive. XFA is not to be ISO standard just yet. The Committee urges Adobe Systems to submit the XFA Specification, XML Forms Architecture (XFA), to ISO for standardization The Committee is concerned about the stability of the XFA specification Part 2 will reference XFA 3.1
Rosenthol, Leonard (2012). "PDF and Standards" (PDF). Adobe Systems. Archived from the original (PDF) on September 2, 2013. Retrieved October 20, 2013 – via Parleys.
"Announcing no-cost access to the latest PDF standard: ISO 32000-2 (PDF 2.0)" (Press release). PDF Association. June 16, 2023 [Updated; originally published 5 April 2023]. Archived from the original on September 23, 2023. Retrieved October 6, 2023.
"ISO 32000-2:2020 is now available". PDFA. December 14, 2020. Archived from the original on December 4, 2022. Retrieved February 3, 2021.
"ISO 32000-2 – Document management — Portable document format — Part 2: PDF 2.0". ISO. January 5, 2021. Archived from the original on January 28, 2021. Retrieved February 3, 2021.
"PostScript Language Reference" (PDF). Archived from the original (PDF) on July 24, 2021.
Anton Ertl, Martin. "What is the PDF format good for?". complang.tuwien.ac.at. Vienna University of Technology. Archived from the original on April 4, 2024. Retrieved April 8, 2024.
"3D supported formats". Adobe Systems Inc. July 14, 2009. Archived from the original on February 12, 2010. Retrieved February 21, 2010.
"Supported file formats in Acrobat and Reader". Adobe Systems Inc. November 11, 2022. Archived from the original on December 21, 2022. Retrieved January 12, 2023.
"JavaScript for Acrobat 3D | Adobe Acrobat Developer Center". Adobe Systems Inc. Archived from the original on November 12, 2009. Retrieved January 12, 2023.
Pravetz, Jim. "In Defense of COS, or Why I Love JSON and Hate XML". jimpravetz.com. Archived from the original on May 2, 2014.
PikePdf documentation. "Working with content streams". Archived from the original on July 5, 2022. Retrieved May 8, 2022.
"Adobe Developer Connection: PDF Reference and Adobe Extensions to the PDF Specification". Adobe Systems Inc. Archived from the original on November 15, 2006. Retrieved December 13, 2010.
Howard, Jacci. "Desktop Publishing: Base 14 Fonts – Definition". About.com Tech. Archived from the original on June 14, 2016.
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"PDF Blend Modes Addendum" (PDF). Archived from the original (PDF) on October 14, 2011. Retrieved January 12, 2023.
Johnson, Duff (April 22, 2004). "What is Tagged PDF?". Archived from the original on August 7, 2004.
"Is PDF accessible?". DO-IT - Disabilities, Opportunities, Internetworking, and Technology. University of Washington. October 4, 2022. Archived from the original on February 10, 2023. Retrieved January 12, 2023.
"FreeMyPDF.com – Removes passwords from viewable PDFs". freemypdf.com. Archived from the original on February 20, 2021. Retrieved June 23, 2009.
Kirk, Jeremy (December 4, 2008). "Adobe admits new PDF password protection is weaker". Macworld. IDG Communications Inc. Archived from the original on January 17, 2017. Retrieved September 14, 2016.
Guignard, Bryan. "How secure is PDF" (PDF). Carnegie Mellon University. Archived from the original (PDF) on October 24, 2005.
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Adobe Systems Inc. (July 1, 2008). "Document Management – Portable Document Format – Part 1: PDF 1.7, First Edition" (PDF). Archived from the original (PDF) on December 3, 2008. Retrieved January 12, 2023.
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"ISO 32000-1:2008 Document management -- Portable document format -- Part 1: PDF 1.7". International Organization for Standardization ISO. Archived from the original on February 10, 2017. Retrieved March 22, 2016.
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"Getting Familiar with Adobe Reader > Understanding Preferences". Adobe Press. Pearson. September 2, 2005. Archived from the original on October 23, 2012. Retrieved January 12, 2023.
"PDF Accessibility". WebAIM. Archived from the original on January 12, 2023. Retrieved January 12, 2023.
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"Accessibility and PDF documents". Web Accessibility Center. The Ohio State University. Archived from the original on April 27, 2010. Retrieved January 12, 2023.
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webaim.org (Global: low place; English: low place)

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