/usr/include/Papyrus3/ is in libpapyrus3-dev 3.7.1+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Papyrus3/DicomDir.h
/usr/include/Papyrus3/DicomDirEnumRecords.h
/usr/include/Papyrus3/DicomDirInitRecords.h
/usr/include/Papyrus3/DicomdirGlobalVar3.h
/usr/include/Papyrus3/DicomdirPrivFunctionDef3.h
/usr/include/Papyrus3/DicomdirPubFunctionDef3.h
/usr/include/Papyrus3/DicomdirTypeDef3.h
/usr/include/Papyrus3/OGlobalDicomFunc.h
/usr/include/Papyrus3/PapyEalloc3.h
/usr/include/Papyrus3/PapyEnumGroups3.h
/usr/include/Papyrus3/PapyEnumImageGroups3.h
/usr/include/Papyrus3/PapyEnumImagesModules3.h
/usr/include/Papyrus3/PapyEnumMiscGroups3.h
/usr/include/Papyrus3/PapyEnumMiscModules3.h
/usr/include/Papyrus3/PapyEnumModules3.h
/usr/include/Papyrus3/PapyError3.h
/usr/include/Papyrus3/PapyErrorMacros3.h
/usr/include/Papyrus3/PapyFileSystem3.h
/usr/include/Papyrus3/PapyGlobalVar3.h
/usr/include/Papyrus3/PapyInitModules3.h
/usr/include/Papyrus3/PapyPrivFunctionDef3.h
/usr/include/Papyrus3/PapyPubFunctionDef3.h
/usr/include/Papyrus3/PapyTypeDef3.h
/usr/include/Papyrus3/PapyWild3.h
/usr/include/Papyrus3/Papyrus3.h