Allison Parrishopen source licenses, as texts that advocate for their own propagation ("The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software"), is a kind of chain letter and maybe by extension could be considered a kind of himmelsbrief, a "letter from heaven," granting protection to those who possess them (and, per the upthread link, "divine punishment for disbelief of their claims")
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