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PDF/A and external references

November 2025 by Peter Wyatt

PDF/A ensures reliable long-term rendering by embedding fonts, images, and color profiles, but URLs can still appear in text, hyperlinks, bookmarks, annotations, metadata, and embedded files.

Link annotations and URI Actions define clickable destinations, but PDF/A restricts certain action types to prevent external dependencies.

Guided by clear policies, comprehensive audits of both visible and hidden references help maintain authenticity, accessibility, and long-term integrity of PDF/A documents and digital collections.

PDF/A ensures reliable long-term rendering by embedding fonts, images, and color profiles, but URLs can still appear in text, hyperlinks, bookmarks, annotations, metadata, and embedded files.

Link annotations and URI Actions define clickable destinations, but PDF/A restricts certain action types to prevent external dependencies.

Guided by clear policies, comprehensive audits of both visible and hidden references help maintain authenticity, accessibility, and long-term integrity of PDF/A documents and digital collections.

PDF 2.0 and ISO 19445 XMP metadata for image and document proofing

January 2023 by Peter Wyatt
Article


How ISO 19445 might be used with PDF 2.0 and related technology updates relevant to the graphic arts industry.

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January 2023 by PDF Association staff
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Along with membership dues, Adobe’s Standards Support Endowment facilities administration of ISO TC 171 SC 2 and sustains the continuing … Read more

PDF Association news

January 2023 by Peter Wyatt
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CTO Peter Wyatt summarizes key takeaways from the first two years of the PDF specification’s public errata process.

Article

January 2023 by Peter Wyatt
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ISO TC 171 SC 2 is publishing new extensions and clarifications to PDF 2.0 in support of advanced cryptography.

Article

December 2022 by Duff Johnson
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In 2023 the PDF Association will focus on technical community while the final phase of the SafeDocs program offers an … Read more

PDF Association news

December 2022 by Matthias Valvekens (Matthias Valvekens)
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A commentary on the interoperability of encrypting PDF documents with public-key cryptography.

Article

December 2022 by Matthias Valvekens (Matthias Valvekens)
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Identifying the signer’s key in a PDF signature: how does that work?

Article

December 2022 by Dietrich von Seggern (callas software GmbH)
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Dietrich von Seggern from callas software explains, how companies can optimally prepare PDF files for variable data printing.

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December 2022 by PDF Association staff
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Adobe releases the source code for an early version of PostScript, the forerunner of PDF.

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November 2022 by PDF Association staff
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DARPA will provide seed funding of $1.3M for research and prototyping centered on reinventing the PDF specification and delivering on … Read more

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November 2022 by PDF Association staff
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Our all-new presentation archive now includes recordings from PDF Days Europe 2022!

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