ผู้สร้างสรรค์งานนี้เสียชีวิตในปี ค.ศ. 1928 ดังนั้นงานนี้จึงเป็นสาธารณสมบัติ ในประเทศต้นกำเนิดและประเทศอื่น ๆ ที่ระยะเวลาการคุ้มครองลิขสิทธิ์น้อยกว่า 95 ปีหลังจากผู้สร้างสรรค์งานเสียชีวิต.

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