Systems and methods for free demonstration of online premium content prior to purchase

Abstract

Key-limited use applications are maintained at a central service where the central service can receive requests from a remote computing device for access to the key-limited use applications. The key-limited use applications include publicly available portions and a locked portions accessible with a key. The central service can provide a key to the remote computing device associated with a key-limited use application for complete access. The key can be stored in a memory device associated with the remote computing device. A digital signature can be assigned to the key to prevent operation of the key in a second computing device. Unauthorized or unlicensed computing devices are prevented from using the applications.

Dependencies are inferred from the claim text.