Pønprijn IJcun (/pønˈpɹeɪn ˈeɪkun/, PIJ) is a set of audio files edited and released by Mikatenoreyune.
All PIJ files are released under the CC0 1.0 Universal, which is equivalent to the public domain. Therefore, anyone can, for example copy, modify or redistribute them, even for commercial purposes, all without asking for permission.
Also, they are signed with the OpenBSD's signify utility. Signatures can be verified with Mikatenoreyune's public keys. (THE VERIFICATION IS OPTIONAL AND USUALLY UNNECESSARY.)