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Unless a book specifically styates that Open Content is present, one should assume there is none.
Speaking of open content, there are numerous third-party publishers who did open some of the content of their d20 material. An example is the late, lamented Guardians of Order and their BESM d20, for which they released a pair of SRDs (incluidng one for mecha). It's an open but somewhat clunky system for point-based characters, incluidng some on the superheroic scale. However, their Tri-Stat System remains closed even though the company is out of business.
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