• Version Used: 0.4.2
• Package: API
• Go Version of Project: 1.20.5
• OS: Ubuntu 23.04

Problem Description

I am trying to fetch the form fields of different PDF files and turn them read-only but during my testing ListFormFields() threw errors quite a few times. I'm using the default config with Reader15 set to true. In order to check whether the problems are with the PDF files or the library I also tried to apply the same action using Apache PDFBox where I was able to list and make the form fields read-only without any problems.

File 1

• File (obtained via Google Search): https://royalegroupnyc.com/wp-content/uploads/seating_areas/sample_pdf.pdf
• Error: pdfcpu: validateNameEntry: dict=Named entry=N invalid dict entry: SaveAs

File 2

• File: 30010061_Einlegerbogen.pdf
• Error: pdfcpu: validateNumberArrayEntry: invalid type at index 3

If you need any additional information I'll gladly provide it. If those PDF files should currently not be supported please let me know and we can close this issue.