This file is indexed.

/etc/legal is in base-files 9.4ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.