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]