Patent ID: 7536725
Filing Date: 2009-05-19
Classification: H04L

Abstract:
1. A method for authenticating download of a digital content file ordered from a web site, the method comprising steps of: receiving a selection of the digital content file with the web site from a client; calculating a first code indicative of the digital content file, wherein if the digital content file is changed, the first code changes, and further wherein the first code is unique to the client; sending the digital content file to a client computer; sending the first code to the client computer; sending a media identifier to the client computer, wherein: storing the media identifier in a remote database cross-referenced to each of: storing the media identifier in a local database coupled to the client computer; calculating a second code indicative of the digital content file after the client computer received the digital content file, wherein the calculating step is configured to be repeated a number of times after download; re-sending the digital content file if the client computer determines the first code doesn't match the second code; when a new version of the digital content file is available: when a license for the digital content file expires, performing the steps of: