/usr/share/librecad/library/sheets/ is in librecad-data 2.0.9-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/librecad/library/sheets/A0H.dxf
/usr/share/librecad/library/sheets/A0V.dxf
/usr/share/librecad/library/sheets/A1H.dxf
/usr/share/librecad/library/sheets/A1V.dxf
/usr/share/librecad/library/sheets/A1_1_draw.dxf
/usr/share/librecad/library/sheets/A1_2_draw.dxf
/usr/share/librecad/library/sheets/A2H.dxf
/usr/share/librecad/library/sheets/A2V.dxf
/usr/share/librecad/library/sheets/A2_1_draw.dxf
/usr/share/librecad/library/sheets/A2_2_draw.dxf
/usr/share/librecad/library/sheets/A3H.dxf
/usr/share/librecad/library/sheets/A3V.dxf
/usr/share/librecad/library/sheets/A3_1_draw.dxf
/usr/share/librecad/library/sheets/A3_2_draw.dxf
/usr/share/librecad/library/sheets/A4.dxf
/usr/share/librecad/library/sheets/A4H.dxf
/usr/share/librecad/library/sheets/A4V.dxf
/usr/share/librecad/library/sheets/A4_1_draw.dxf
/usr/share/librecad/library/sheets/A4_1_text.dxf
/usr/share/librecad/library/sheets/A4_2_draw.dxf
/usr/share/librecad/library/sheets/A4_2_text.dxf