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This file is in the public domain, probably because it's from Glitch. Tiny Speck released Glitch's library of art assets for everyone to use:

All files are provided by Tiny Speck under the Creative Commons CC0 1.0 Universal License. This is a broadly permissive "No Rights Reserved" license — you may do what you please with what we've provided. Our intention is to dedicate these works to the public domain and make them freely available to all, without restriction.