This work was first published in Bangladesh and is now in the public domain because its copyright protection has expired by virtue of the Copyright Act, enacted 2000 (details). The work meets one of the following criteria:

• It is an anonymous, pseudonymous or posthumous work and 60 years have passed since the year of its publication
• It is a photographic or cinematographic work and 60 years have passed since the year of its publication
• It is a government work or a work of an international organisation and 60 years have passed since the year of its publication
• It is a literary, dramatic, musical or artistic work and 60 years have passed since the year of death of the author (or last-surviving author)