Irrevocable license
Defined in 1 dictionary — Ballentine's (1916)
Ballentine's Law Dictionary
James A. Ballentine · 1916
One in the exercise of which the licensee has made improvements or invested capital. See 87 Cal. 126, 22 Am. St. Rep. 234, 11 L. R. A. 134, 25 Pac. 268, one connected with an interest or grant. See 22 Am. St. Rep. 238, note.