We want a utility that lets us add certain information to an editable PDF file. I'm not sure which one we need. Is it:
1) The PDF form filler, or
2) The SDK version?
We want to be able to do the PDF changes from within our VB6 program, or from an ASP.NET program (using VB.NET)
Which version do we need?
Add Annotation to PDF File in C#
How do I add annotations to an existing PDF file?
C# - Render, view, annotate pdf files
C# PDF Annotate Library: Draw, edit PDF annotation, markups in C#
VeryPDF HTML5 PDF Annotation,
You can integrate "PDF Editor OCX Control (ActiveX)" into your VB6 or VB.NET or ASP.NET application to edit PDF contents or fill PDF forms or annotate PDF files easily.
Fillable and flat PDFs—what's the difference?
Not all forms are fillable. Sometimes form creators don't convert their PDFs to interactive fillable forms. Or they intentionally design a form that you can fill in only by hand or with the Adobe Fill & Sign tool. These non-interactive forms are called flat forms.
An interactive form contains fields that you can select or fill in, eliminating the need to print the form and complete it by hand.
Use VeryPDF PDF Editor GUI or PDF Editor OCX to fill out a PDF form and sign it
You can use VeryPDF PDF Editor GUI or PDF Editor OCX to quickly scroll through an interactive, fillable PDF and to fill in all necessary fields. VeryPDF PDF Editor GUI or PDF Editor OCX detects the fields and lets you tab or arrow from field to field. This eliminates the time-consuming and wasteful steps of printing the file, using a pen to fill out and sign the form, and scanning and re-uploading the file for return sending. Instead, use VeryPDF PDF Editor GUI or PDF Editor OCX to complete, sign, send, and store your PDF forms.