Sections 37 to 39 of the Copyright Act, BE 2537 (1994) (translation) state that:
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To add your language to the list of languages supported by this template, please copy the code of Template:FoP-Thailand/en (or any other language version you prefer to translate) and replace the text strings in there (the form below can be used to create a translation, the English version is preloaded in the edit box). Please change the parameter lang from en (or whatever language you are translating) to the language code of your language.