Links in the internet archive suggest that it is open source:
Quote:
Grand L... de la langue française
Publication date 1989
Topics français, langue française, français (langue), orthographe, dictionnaire, orthographe d’usage, encyclopédies, recte gallice loquor
Collection opensource
Language French
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pdf-link to the internet archive
dvju.txt-link to the internet archive
Why did it take 128 posts before this became apparent? Bad @pzack! You should really give better info.