Contributory infringement

A form of secondary copyright or patent liability in which a party that has not directly infringed is nonetheless liable because it knowingly induced, facilitated, or materially contributed to another party's direct infringement. In copyright, contributory liability requires knowledge of the infringing activity and a material contribution to it; in patent, it requires selling a component specifically designed for use in a patented combination with no substantial noninfringing use. Litigation funders encounter contributory infringement claims primarily in cases targeting platforms, component suppliers, and distributors whose direct-infringement liability is limited or absent. The doctrine expands the defendant pool and can provide funders access to deep-pocketed defendants who are upstream of the primary infringer, significantly affecting recovery potential and the case's commercial structure.

Contributory theories are underwritten primarily as a defendant-selection tool: they let a funder reach an upstream component supplier or platform with deeper resources than the direct infringer, which materially changes collectability even when the direct infringer's liability is uncontested. The knowledge and material-contribution elements are diligenced closely because they are more fact-intensive and more frequently contested than direct infringement, so funders model a meaningfully higher liability-risk discount on the contributory theory than on the underlying direct claim.