Here are the current rules for standard DCs (Type 1 and 0) - updated and improved over time, while being kept as simple as practicable:

# the size of an Issue (edition) is one hundred (100) - this is a fundamental rule, which is very unlikely to be changed, and certainly not for the DCs already in existence. if a DC contains text there might be language versions (100 max in any language).
# each DCD (Document = single print) is signed, embossed or stamped and numbered, from 99 to 00, 00/99 being the last one.
# three (3) is a maximum of DCDs that can be acquired from one Issue by any one person.
# the Issuer can refuse to sell, to anyone, at any time.
# new Issues - with a theme - are announced in advance, so that they can be pre-ordered. anyone can contribute data or pictorial elements for possible inclusion in an Issue.
# particular data or pictorial elements can be included in a single DCD, if so requested.
# each DCD is replaceable if damaged - return it for a replacement at a nominal cost, within lifetime of the Issuer.
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