Reverse payment patent settlement

Reverse payment patent settlements, also known as "pay-for-delay" agreements, are a type of agreement that has been used to settle pharmaceutical patent infringement litigation (or threatened litigation), in which the company that has brought the suit agrees to pay the company it sued. That is, the patent holder pays the alleged infringer to stop its alleged infringing activity (e.g., to stop selling a generic version of a drug) for some period of time and to stop disputing the validity of the patent.

Source: Wikipedia — Reverse payment patent settlement (CC BY-SA 4.0)