Is there some kind of setting that the form author used to compel
this behavior?
Not sure, but below are the configurable permissions (as documented in
pdftk --help). Notice there is a "FillIn" permission. Maybe that
controls your ability to save?
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[allow <permissions>]
Permissions are applied to the output PDF only if an encryption
strength is specified or an owner or user password is given. If
permissions are not specified, they default to 'none,' which
means all of the following features are disabled.
The permissions section may include one or more of the following
features:
Printing
Top Quality Printing
DegradedPrinting
Lower Quality Printing
ModifyContents
Also allows Assembly
Assembly
CopyContents
Also allows ScreenReaders
ScreenReaders
ModifyAnnotations
Also allows FillIn
FillIn
AllFeatures
Allows the user to perform all of the above, and top
quality printing.
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