I have a document with three section. The document protection is "Filling in Form". The first und last section are unchecked for protection. Only the second section will be protected.
If you load the document with Aspose, the property ProtectionType of document is "NoProtection". That's wrong.
The same with Word API, you get the correct ProtectionType property as WdProtectionType.wdAllowOnlyFormFields.
A sample doc can you find in attachment