A more thorough explanation:

A perpetual injunction is a court order that prohibits a person or entity from doing a certain action permanently. It is also known as a permanent injunction.

For example, if a company is found guilty of infringing on another company's patent, a perpetual injunction may be issued to prevent the infringing company from continuing to use the patented technology.

This type of injunction is granted after a final hearing on the merits of the case. Despite its name, a perpetual injunction does not necessarily last forever and can be modified or dissolved if circumstances change.