/usr/share/liblouisutdml/lbu_files/ is in liblouisutdml-data 2.5.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/liblouisutdml/lbu_files/ThML.sem
/usr/share/liblouisutdml/lbu_files/Workbook.sem
/usr/share/liblouisutdml/lbu_files/article.sem
/usr/share/liblouisutdml/lbu_files/book.sem
/usr/share/liblouisutdml/lbu_files/brf.cfg
/usr/share/liblouisutdml/lbu_files/chapter.sem
/usr/share/liblouisutdml/lbu_files/doc.sem
/usr/share/liblouisutdml/lbu_files/document-content.sem
/usr/share/liblouisutdml/lbu_files/document.sem
/usr/share/liblouisutdml/lbu_files/dtbook.sem
/usr/share/liblouisutdml/lbu_files/dtbook3.sem
/usr/share/liblouisutdml/lbu_files/dtbookutd.sem
/usr/share/liblouisutdml/lbu_files/gutbook.sem
/usr/share/liblouisutdml/lbu_files/html.sem
/usr/share/liblouisutdml/lbu_files/liblouisutdml.ini
/usr/share/liblouisutdml/lbu_files/marburg.cfg
/usr/share/liblouisutdml/lbu_files/marburg.sem
/usr/share/liblouisutdml/lbu_files/math.sem
/usr/share/liblouisutdml/lbu_files/nemeth.sem
/usr/share/liblouisutdml/lbu_files/nimas.cfg
/usr/share/liblouisutdml/lbu_files/nimas.sem
/usr/share/liblouisutdml/lbu_files/package.sem
/usr/share/liblouisutdml/lbu_files/preface.sem
/usr/share/liblouisutdml/lbu_files/preferences.cfg
/usr/share/liblouisutdml/lbu_files/sample-utd.cfg
/usr/share/liblouisutdml/lbu_files/set.sem
/usr/share/liblouisutdml/lbu_files/transinxml.cfg
/usr/share/liblouisutdml/lbu_files/ukmaths.cfg
/usr/share/liblouisutdml/lbu_files/ukmaths.sem
/usr/share/liblouisutdml/lbu_files/utd.sem
/usr/share/liblouisutdml/lbu_files/viewxml.cfg
/usr/share/liblouisutdml/lbu_files/viewxml.ctb
/usr/share/liblouisutdml/lbu_files/volumes.cfg
/usr/share/liblouisutdml/lbu_files/w_wordDocument.sem
/usr/share/liblouisutdml/lbu_files/wordDocument.sem