This work formerly enjoyed copyright in Singapore but is now in the public domain because its term of copyright has expired. According to the Copyright Act (Cap. 63) of Singapore:
for ...
copyright has expired if ...
pursuant to ...
Works by private persons
a published or unpublished artistic work other than —
a photograph; and
an engraving not published before the death of the author
70 years have passed since the end of the calendar year in which the author of the work died