Cannot list annotations (version error)

[little-flag]

Getting this error:

> pdfcpu annot list test.pdf
dict=annotDict entry=NM: unsupported in version 1.3
This file could be PDF/A compliant but pdfcpu only supports versions <= PDF V1.7

The PDF in question is v1.3, produced by macOS (13.5.1) Quartz PDFContext. It's very simple, just some placeholder text and an underline annotation.

Is this a known/intended limitation? (Using pdfcpu CLI v0.5.0, though I had the same problem with previous version too.)

My use case is that I'd like to use pdfcpu to replace a bunch of non-Go code that I need to extract annotations (particularly pdfannots, which relies on pdfminer.six/Python). Just testing to see how plausible this is.

[hhrutter]

This file is in violation of the PDF specification.
The optional NM entry in annotation dicts is defined for PDF Versions 1.4 and beyond only.

[little-flag]

Thanks. I guess this is a problem with macOS.

Edit: In fact it seems that any PDF produced with either macOS or iOS/iPadOS (using Apple tech; Quartz, presumably) produces this same problem. Will try to log this as feedback for Apple…

[hhrutter]

True and good idea to report this 👍🏻
Nevertheless, the latest commit relaxes validation of that attribute!