/usr/share/sagemath/ellcurves/rank12 is in sagemath-database-elliptic-curves 0.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | 269601712590130409544942497797 a 1 [0,0,1,-6349808647,193146346911036] 12 1
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