Qualcomm by all accounts developed technology that's key to the fundamental way wireless devices communicate. The debate is how much that technology is worth, especially as phones become ever more complicated. The chipmaker has contended that Apple instigated regulatory actions against it around the world by lying to government officials. Apple, in court filings, said it only testified in hearings in South Korea because it was asked to do so by officials there. That's a key part of the arguments between the two. Qualcomm is withholding about $1 billion Apple says it's owed in rebates. The chipmaker is citing Apple's testimony against it in South Korea, where the Korea Fair Trade Commission found it guilty of antitrust violations, as a breach of contract and justification for not paying. Unlike other phone makers, Apple doesn't have a direct license with Qualcomm and has paid via its suppliers. Each side contends the other failed to make good-faith negotiations for a license.