/usr/share/librecad/library/block/ is in librecad-data 2.0.9-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/librecad/library/block/blk1.dxf
/usr/share/librecad/library/block/block10.dxf
/usr/share/librecad/library/block/block11.dxf
/usr/share/librecad/library/block/block12.dxf
/usr/share/librecad/library/block/block13.dxf
/usr/share/librecad/library/block/block14.dxf
/usr/share/librecad/library/block/block15.dxf
/usr/share/librecad/library/block/block16.dxf
/usr/share/librecad/library/block/block17.dxf
/usr/share/librecad/library/block/block18.dxf
/usr/share/librecad/library/block/block19.dxf
/usr/share/librecad/library/block/block2.dxf
/usr/share/librecad/library/block/block20.dxf
/usr/share/librecad/library/block/block21.dxf
/usr/share/librecad/library/block/block22.dxf
/usr/share/librecad/library/block/block23.dxf
/usr/share/librecad/library/block/block24.dxf
/usr/share/librecad/library/block/block25.dxf
/usr/share/librecad/library/block/block26.dxf
/usr/share/librecad/library/block/block27.dxf
/usr/share/librecad/library/block/block28.dxf
/usr/share/librecad/library/block/block3.dxf
/usr/share/librecad/library/block/block4.dxf
/usr/share/librecad/library/block/block5.dxf
/usr/share/librecad/library/block/block6.dxf
/usr/share/librecad/library/block/block7.dxf
/usr/share/librecad/library/block/block8.dxf
/usr/share/librecad/library/block/block9.dxf