introduce software or automated agents or scripts to the Sites or Services so as to produce multiple accounts, generate automated searches, requests and queries, or to strip, scrape, or mine data from the Sites or Services (except that we grant the operators of public search engines revocable permission to use spiders to copy materials from the Sites or Services for the sole purpose of and solely to the extent necessary for creating publicly available searchable indices of the materials, but not caches or archives of such materials).