/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/ is in python-seqdiag 0.9.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/alt_block.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/altblock.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/diagram_class.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/diagram_edge_length.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/nested_altblock.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/node_activated.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/node_fontsize.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/node_notes.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/plugin_autoclass.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/separators.diag
/usr/lib/python2.7/dist-packages/seqdiag/tests/diagrams/separators_in_subedge.diag