There are multiple definitions - click on the translation that matches your context.

不可废除的权利

名词

full

indefeasible right

noun

Definitions of indefeasible right

a right that cannot be taken away, overturned, or made invalid in any way. The term is often used to refer to a right that cannot be defeated in court.

IDT hereby grants and conveys to Net2Phone an indefeasible right to use and enjoy those equipment items.