Personal jurisdiction in Internet cases refers to a growing set of judicial precedents in American courts where personal jurisdiction has been asserted upon defendants based solely on their Internet activities. Personal jurisdiction in American civil procedure law is premised on the notion that a defendant should not be subject to the decisions of a foreign or out of state court, without having "purposely availed" himself of the benefits that the forum state has to offer. Generally, the doctrine is grounded on two main principles: courts should protect defendants from the undue burden of facing litigation in an unlimited number of possibly remote jurisdictions (in line with the due process requirements of the Constitution), and courts should prevent states from infringing on the sovereignty of other states by limiting the circumstances under which defendants can be "haled" into court.