As with prescribers to the movement, not all Quakers were antislavery; still, by the 1780s, the Quakers passed an edict barring any Quaker from owning slaves.
Now, the government takes the position, as have many, that for spending clause legislation, that the remedy is only that of Congress, of the agency withholding money from someone who violates its provisions.
Both copyright and Creative Commons are important parts of a system that come with a responsibility to follow rules, rules that support the future work of people and organizations who can make our world a better place.