Plaintiffs Ericsson Inc. and Telefonaktiebolaget LM Ericsson's filed a motion to compel discovery of source code and technical documents, pursuant to Local Patent Rule 3-4 in the Eastern District of Texas. As explained by the district court, Patent Local Rule 3-4 requires the party opposing a claim of infringement to produce or make available "[s]ource code, specifications, schematics, flow charts, artwork, formulas, or other documentation sufficient to show the operation of any aspects or elements of an Accused Instrumentality identified by the patent claimant in its P. R. 3-1 chart."