How is an irrevocable license affected if a lot of money was spent based on this permission?

An irrevocable license is a type of permission that cannot be revoked once granted, and it usually arises when a licensee has made significant investments or expenditures based on that permission. When a party has spent a considerable amount of money as a result of relying on the irrevocable license, the legal concept of equitable estoppel may come into play, which prevents the licensor from revoking the license to avoid unjustly harming the licensee who has relied on it.

In this scenario, since the investments made were based on the reliance on an irrevocable license, the license remains irrevocable. This principle upholds the fairness of allowing individuals or entities to rely on the permissions granted to them, encouraging reasonable reliance and investment in good faith.

The other options would suggest that the status or enforceability of the license has changed, which is not the case here. Therefore, under the circumstances described, the irrevocable license remains binding and maintains its irrevocable status despite any financial commitments made based on that permission.