File:Rongorongo-dietrich-guidingstarmodifier-nahokuaiaina-starswhichateruledtheland.png

Summary
The rongorongo writing system was invented by the Rapa Nui/Polynesian people sometime before European contact (medieval/early modern). The original authors of the script are unknown, and their work pre-dates any active term of copyright. Moreover, rongorongo is a writing system and is ineligible for copyright.
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