ex necessitate rei

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
EX NECESSITATE REI. From the necessity of the thing. Many acts may be done 
ex necessitate ret, which would not be justifiable without it; and sometimes 
property is protected, ex necessitate rei, which, under, other 
circumstances, would not be so. For example, property put upon the land of 
another from necessity, cannot be distrained for rent. See Distress; 
Necessity. 
    

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