Computer services, namely, providing programming, consulting, maintenance, and design of data systems, in particular for the following types of computer software-- for data storage, for computer file systems, for computer caches and tape storage, for eliminating redundant data before data storage and communication, for computer communications software for network caches, for computer communication software for network protocols, for computer communication software for the transmission of files, electronic mail, web pages, software, and databases, for computer search engine software containing index, comparison and retrieval capabilities, for data compression software, for computer filtration software, namely for detection of unwanted electronic mail and attachments and for the identification of frequently occurring spans of data in data streams, for computer utility programs for the purpose of backing up and archiving data, and for computer utility programs for the purpose of identifying files of similar content in a file system; recovery of computer data; providing online computer databases in the fields of computers and information technology; consultancy in the field of computer rental; updating of computer software; leasing access time to a computer for the manipulation of data; rental of computer software; professional consultancy in the fields of information technology and computer information security