Content purchasing

In one implementation, a computer-implemented method includes receiving, at a computing device and from a computer server system, digital content that is for sale and that is received without having yet been purchased by a user of the computing device; storing the digital content locally on the computing device in a manner that prohibits user access to the digital content; after storing the digital content: receiving user input that indicates the user is purchasing at least a portion of the stored digital content; and in response to the received user input, storing information that indicates the user purchased the portion of the digital content and providing the user with access to the purchased portion of the digital content; and in response to detecting that the computing device is communicatively connected to the computer server system over a network, providing the stored information to the computer server system.