2.1.1719 Part 1 Section 22.2.2.7, DocSecurity (Document Security)
a. The standard states that the valid values of the DocSecurity element are 1, 2, 4, and 8.
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Office also supports a value of 0, signifying that no security level is defined.
b. The standard states that the valid values of the DocSecurity element are 1, 2, 4, and 8.
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Excel does not support the values 4 or 8.
c. The standard does not state that the values of this element can be combined.
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Office allows the values of this element to be combined.