Saving with encryption left a dictionary's /Contents in clear whenever it
had a string /Contents and an array /ByteRange, whatever else it was. A
source file could add a /ByteRange to an ordinary annotation and its
comment text was then written unencrypted. A dictionary with a /Subtype or
a /Type other than Sig or DocTimeStamp is never a signature dictionary, so
its /Contents is encrypted like any other string.
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