Decoded common AcroForm field flags from /Ff. See ISO 32000-2:2020, 12.7.4.1, Tables 226 ("Entries common to all field dictionaries") and 227 ("Field flags common to all field types").
/Ff
Readonly
The field is excluded from form submission/export.
The field cannot be edited by the user.
The field must have a value when the form is submitted.
Decoded common AcroForm field flags from
/Ff. See ISO 32000-2:2020, 12.7.4.1, Tables 226 ("Entries common to all field dictionaries") and 227 ("Field flags common to all field types").