> Is it really possible to have a license that says "you can't challenge the validity of lawsuits that stem from patents we own/profit from"? If you mean "chal

> Is it really possible to have a license that says "you can't challenge the validity of lawsuits that stem from patents we own/profit from"? If you mean "challenge the validity of the patents," then it is absolutely possible, and it is a very common thing to put into a license. You don't want your licensee to insulate himself from suit by signing the license agreement, and then immediately turn around and sue for a declaratory judgment of invalidity. Having this clause puts the spectre of an infringement suit into his head, and it makes him less likely to challenge your patent's validity.