U.S. federal trademark · Serial No. 78942296 · Reg. No. 3557609
Computer services, namely, creating indexing of information, sites and other resources available on computer networks for providing identifiers for digital objects and other resources in distributed computer systems and ensuring that such identifiers are unique over long time periods and for locating and identifying digital objects in the nature of data structures whose principal components are digital materials plus a unique identifier for this data and other information pertaining to this data
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