Lex posterior derogat priori - "Later law removes the earlier." More recent law overrules older ones on the same matter.⏎
Nemo dat quod non habet - [6] The basic rule that a person who does not own property (e.g. a thief) cannot confer it on another except with the true owner's authority (i.e. as his agent). Exceptions to this rule include sales under statutory powers, and cases where the doctrine of estoppel prevents a legal owner from denying a seller's right to sell.⏎
Lex retro non agit - "The law does not operate retroactively." A law cannot make something illegal that was legal at the time it was performed. See ex post facto law.⏎
Nemo auditur propriam turpitudinem allegans - "No one can be heard, who invokes his own guilt." Nobody can bring a case that stems from their own illegal act.⏎