The PDF Association and the PDF/UA Technical Working Group announced that Matterhorn Protocol version 1.1 is available. This is the 2021 update with a new error condition and several clarifications. More information is available here.
The third part of our PDF/A series covers PDF/A-3, which is considered the current standard for archiving and e-invoices. This does not mean that PDF/A-1 or PDF/A-2 are no longer valid. Depending on the use case, older PDF/A formats can still be fully sufficient. PDF viewers are backward-compatible, so PDF/A-1 remains valid even though newer formats exist. Still, PDF/A-3 is currently treated as the standard format.
