The original word list was created in the 90's for a now-defunct exam (see README.md for more details). It's unclear what the copyright status of that text is.
Bill Walker with others' help provided translations. Those translations came from various sources. (Who owns the translation of a word?)
Bill Walker has kindly given permission for his gcselist.htm file to be… See the full description on the dataset page:
https://huggingface.co/datasets/Infinitestarcode/esperanto.