(31)In principle, in the case of goods with digital elements whereby the digital content or digital service incorporated in or inter-connected with the goods is supplied through a single act of supply, the seller should only be liable for a lack of conformity that exists at the time of delivery. However, the obligation to provide updates should reflect the fact that the digital environment of any such good constantly changes. Therefore, updates are a necessary tool in order to ensure that the goods are able to function in the same way that they did at the time of delivery. Furthermore, in contrast to traditional goods, goods with digital elements are not completely separate from the seller's sphere because the seller, or a third person supplying the digital content or digital service under the sales contract, is able to update the goods from a distance, usually over the internet. Therefore, if the digital content or digital service is supplied by a single act of supply, the seller should be liable to provide the updates necessary to keep the goods with digital elements in conformity for a period of time that the consumer can reasonably expect, even if the goods were in conformity at the time of delivery. The period of time during which the consumer can reasonably expect to receive updates should be assessed based on the type and purpose of the goods and the digital elements, and taking into account the circumstances and nature of the sales contract. A consumer would normally expect to receive updates for at least as long as the period during which the seller is liable for a lack of conformity, while in some cases the consumer's reasonable expectation could extend beyond that period, as might be the case particularly with regard to security updates. In other cases, for instance as regards goods with digital elements the purpose of which is limited in time, the seller's obligation to provide updates would normally be limited to that time.