This work originated in Thailand and is in the public domain according to sections 19 and 20 of Thailand's Copyright Act, 2537 BE (1994) (Translation), because:

  1. the author (or the last co-author) was a natural person and died at least 50 years ago, or
  2. the author is/was a juristic person or the author is not known, and at least 50 years have passed since the creation of the work, or if the work was published during such period of 50 years, at least 50 years have passed since the first publication of the work.

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