Patent ID: 8417966

Claim:
A computer-implemented method of providing registration information for measuring consumption of media content, comprising: performing, by one or more computing devices: computing, for at least one encrypted content file representing one or more content items, a set of registration hash values, wherein at least one of the registration hash values in the set is computed by applying a hash function to a block of data of the encrypted content file, wherein the block of data corresponds to a segment of at least one of the content items; providing to a measurement entity at least one set of registration hash values associated the one or more content items; sending to the measurement entity a content ID corresponding to the content item corresponding to at least one set of registration hash values; receiving a cryptographically hashed version of the content ID from the measurement entity, wherein the content ID is cryptographically hashed; and delivering at least one encrypted content file representing at least one of the one or more content items to one or more content viewer systems; wherein one or more of the registration hash values provided to the measurement entity can be used in measuring consumption of the content items delivered to at least one of the content viewer systems; wherein the cryptographically hashed version of the content ID for the content item is configured to identify the content item being at least partially played back in the at least one content viewer system.