2.1.1775 Part 4 Section 14.8.2.5, Additional attributes for writeProtection element (Part 1, 17.15.1.93)
a. The standard specifies additional attributes for the writeProtection element.
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Word ignores the additional attributes (algorithmName, hasValue, saltValue, and spinCount) when attributes from "[ISO/IEC-29500-1] §17.15.1.93; writeProtection" are present.