When combatting allegations of copyright infringement, the defendant can argue that the copyright holder authorized the activity at issue, either expressly or implicitly. Exclusive rights under copyright have a common constituent: they represent activities that the copyright holder can authorize or prohibit, authorization being necessary to avoid liability for infringement. Authorization from the copyright holder may be explicit and not raise interpretative difficulties, or it may be implied. The doctrine of implied consent has not received harmonization at EU level but can be found in national laws with regard to interpreting a contractual relationship or conduct. Written agreements may include implied contractual terms and in this context, the implied license doctrine is viewed as a ramification of contract law. But implied authorization may be assumed even in the absence of an agreement or prior communication, where the conduct of the copyright holder gives the impression that a particular activity is permitted. This understanding of implied consent can be traced to German jurisprudence and a body of recent cases that have affirmed the existence of implied authorization where copyright holders did not signify their refusal to consent to a specific activity e.g. by not enacting access control mechanisms in their online content. The judicially created doctrine of ‘implied consent’ is crucial to the functioning of essential Internet facilities such as search engines. This chapter discusses the scope of this doctrine, its applicability to other Internet services, its potential to serve as a defensive rule, and the way in which Svensson can be read as introducing an implied consent defence into EU copyright law.