It is very unlikely that this work is public domain in the EU, or in any country where the copyright term is life-plus-70 years. However, it is in the public domain in Canada (where IMSLP is hosted) and other countries where the term is life-plus-50 years (such as China, Japan, Korea and many others worldwide). As this work was first published before 1923 or failed to meet notice or renewal requirements to secure statutory copyright with no "restoration" under the GATT amendments, it is very likely to be public domain in the USA as well.
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|Alternative. Title||Angelo, tyran de Padoue, drame en 3 journées (en 5 actes)|
|First Performance.||1905 February 7|
|Librettist||Victor Hugo (1802-1885)|
|Composer Time PeriodComp. Period||Romantic|
BNF doesn't list any entries for the complete incidental music, it seems. External link gives several reviews for the premiere; there's information in a book about Sarah Bernhardt as well (who was Tisbé in the premiere.) The work itself may well be lost(?) except for this pavane (in its piano form and a 1909-published orchestral form) (and perhaps for vocal excerpts? A search for Angelo Hahn seems to collect some vocal recitals as well as performances of the piano version of this, for some reason...)