I've a huge amount of PDF files, and I need to determine programmatically which ones are fillable and which ones are not (because of the PDF security options). Is there any way to do that?
So far the best solution I've tried is a batch script based on pdftk, as suggested here: https://stackoverflow.com/a/4396189/112934. This way, I've discarded all the non password-protected files. But I've found some PDFs that, despite being password protected, are fillable.
Any ideas? I don't mind writing a small Java application if there is some easy to use API, but I'd prefer a batch script...
PS: just to clarify - what I need to determine is whether the "Filling form of fields" security option is set to "Allowed" or "Not allowed".