Patent ID: 8543824

Claim:
A method, comprising: identifying, by one or more first server computers, a content item; creating, by one or more first server computers, a cryptographic hash of at least a portion of the content item; storing the content item on one or more content distributors, the one or more content distributors different from the one or more first server computers; creating, by one or more first server computers, a ticket file including the cryptographic hash and information relating to downloading the content item from one or more second server computers, the one or more second server computers different from the one or more first server computers; receiving, by the one or more first server computers, a request for the content item from a user system; distributing, from the one or more first server computers, the ticket file to the user system separate from the content item; receiving, by the one or more first server computers, a notification from the user system that a verification of the content item using the cryptographic hash has failed; and subsequent to receiving the notification that the verification of the content item using the cryptographic hash has failed, initiating, from the one or more first server computers, a security action against the one or more content distributors in response to the failed verification.