Unjust enrichment
General legal principle obliging anyone who is enriched at another's expense without legal cause to restore the benefit obtained. No fault required. Its elements: enrichment of the defendant, correlative impoverishment of the claimant, causal link and absence of legal cause. Source of obligations alongside contract and tort, subsidiary in nature.
Other General terms
Extinction of a right or legal action due to the legally established time period expiring without exercise. In criminal law, it extinguishes criminal liability.
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