/usr/share/live/build/archives/live.debian.net is in live-build 3.0~a24-1ubuntu32.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Debian Live Project
deb http://live.debian.net/ @DISTRIBUTION@-snapshots @ARCHIVE_AREAS@
deb-src http://live.debian.net/ @DISTRIBUTION@-snapshots @ARCHIVE_AREAS@
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