Matthias Valvekens explains the difference and respective value of digital signatures vs. MAC-based technology for authenticating PDF files.

Matthias Valvekens, the ISO project leader who led development of ISO 32004, has written a pair of blog posts to explain what ISO 32004 does and does not achieve in leveraging MAC technology for securing encrypted PDF files against tampering.

The MuPDF 1.20.0 release focuses on improving annotations, enhanced form handling, and ease of integration.

The PDF Association has updated IANA’s MIME media types registry for FDF, XFDF, PRC and U3D.

Non-rectangular links are coming to PDF 2.0! This article offers some background to link technology in PDF and discusses the forthcoming Extension to PDF 2.0.

With the publication of ISO/TS 24064 PDF 2.0 now supports three 3D formats: U3D, PRC and STEP.

PDF Association’s CTO, Peter Wyatt discusses text strings in PDF.

Almost every email client can save email messages as PDF files, but none do so in a manner that retains email structures or metadata proving message authenticity. The EA-PDF specification development effort will explore a better way.

This freely-available PDF file includes 8 test cases that only render correctly if the abbreviated key name is used. If the full key name is used then something else happens (precisely what is implementation dependent!).

PDF issues has been redesigned based on industry feedback: all resolved errata are now published via https://pdf-issues.pdfa.org.