A more thorough explanation:

Definition: In perpetuity means forever.

For example, if someone has the right to receive the profits from land in perpetuity, it means they will receive those profits for as long as the land exists. Similarly, a perpetual copyright grants one the right to use the copyright indefinitely, meaning the owner can use it for as long as they want.

Another example of in perpetuity could be a trust fund set up to provide financial support to a person or organization for an indefinite period of time.

Overall, in perpetuity refers to something that will last forever without any end or expiration.