Black's Law Dictionary, Sixth Edition, p. 425:
de jure: Descriptive
of a condition in which there has been total compliance with all requirements
of law. Of right; legitimate; lawful; by right and just title.
In this sense it is the contrary of de facto (q.v.). It
may also be contrasted with de gratia, in which case it means
"as a matter of right," as de gratia means "by grace or
favor." Again it may be contrasted with de aequitate;
here meaning "by law," as the latter means "by equity".
[Black's Law Dictionary, Sixth Edition, p. 425]