为什么 Mac 上的 Preview 不尊重 PDF 文件中的“只读”标志？

Question

I'm working on a django project using pdfrw to fill a fillable pdf form.

I'm setting the Ff = 1 flag in order to make the fields read-only.

for annotation in template_path.Root.AcroForm.Fields:
    #  the code goes here
    annotation.update(pdfrw.PdfDict(Ff=1))

This seems to work in every viewer I tested so far except for "Preview" the native mac app to open and display pdf files.

Why is that? Am I missing something? Is there another way of achieving this?

Answer 1

You are not missing anything.

Preview.app is POISON for fillable forms. This piece of s**tware must be avoided at all price in connection with forms.

Workaround: have your users use something useful, such as Adobe Acrobat (Reader).