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Is that signing certificate still valid?

A developer signed an installer package in April 2017 and it’s still valid, but Apple signed a Catalina installer app in December 2019 and its certificate has now expired. This article explains why.

January 20, 2026 Macs, Technology

Painted stories of the Decameron: Overview and contents

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Six from the hundred stories told by the 7 women and 3 men who fled from the Black Death in Florence. With a bonus story, the most famous, at the end.

January 19, 2026 General, Life, Painting

Solutions to Saturday Mac riddles 343

I hope you enjoyed Saturday’s Mac Riddles, episode 343. Here are my solutions to them. 1: In between […]

January 19, 2026 General, Macs, Technology

Which cryptexes does macOS Tahoe load?

Which system and AI cryptexes are loaded during macOS boot? Here are details of the 28 for AI in Tahoe 26.2, and which are new since Sequoia 15.5.

January 19, 2026 Macs, Technology

A painted weekend in the Alhambra 1886-1914

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Spectacular landscapes and details painted by John Ferguson Weir, Laurits Tuxen, Joaquín Sorolla, John Singer Sargent, Théo van Rysselberghe, and others.

January 18, 2026 General, Life, Painting

Last Week on My Mac: Local network privacy revealed

Local network privacy protection, introduced in macOS Sequoia, doesn’t use TCC as most others do, but sets up a packet filter in Network Extension. Here are details.

January 18, 2026 Macs, Technology

A painted weekend in the Alhambra 1767-1883

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Exquisite Arabic Muslim art and architecture in Granada, painted in topographic views, and by Franz von Lenbach, Henri Regnault, Martín Rico, Childe Hassam, Tom Roberts and others.

January 17, 2026 General, Life, Painting

Saturday Mac riddles 343

Here are this weekend’s Mac riddles to entertain you through family time, shopping and recreation. 1: In between […]

January 17, 2026 General, Macs, Technology

What’s happening with code signing and future macOS?

An overview of code signing and certificate requirements to come when macOS 27 is released in a few months, supporting only Apple silicon Macs. How Intel Macs will be affected in the near future.

January 17, 2026 Macs, Technology

In memoriam Carlos Schwabe: 1 1890-96

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Originally a designer of wallpaper and book illustrator, his strikingly original paintings accompany works by Zola and Charles Baudelaire.

January 16, 2026 General, Life, Painting

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