The original Chinese text of the book “道德经” authored by 老子 is/are in the public domain and not protected by copyright because at least 100 years (viz. 2326) have passed since the author’s death in 300 BC.

The Korean translation of the book “道德经” (“도덕경”) authored by Wikisource is/are distributed under the GNU Free Documentation License.

The English translation of the book “道德经” (“Tâo Teh King”) authored by James Legge is/are in the public domain and not protected by copyright because at least 100 years (viz. 129) have passed since the author’s death in 1897.