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(Reuters) – A highly anticipated talk on how to identify users of the Tor service, widely used to access the Internet anonymously, has been withdrawn from next month’s annual Black Hat security conference. Hacking experts disclose vulnerabilities at conferences to alert the public about security flaws, both to pressure developers to fix them and to warn users about products that may not be completely safe. Here are some examples of other hacking talks that have been pulled from conferences over the past decade: 2013 – Three European computer scientists canceled a talk on hacking the locks of luxury cars at a prestigious U.S. academic conference known as USENIX, after Volkswagen AG obtained a restraining order from a British court. 2007 – Security firm IOActive Inc pulled a talk at Black Hat DC on bugs in radio-frequency identification, or RFID, technology, saying it was pressured to do so by RFID technology firm HID Global Corp. 2005 – Cisco Systems Inc persuaded security firm Internet Security Systems to pull a discussion on hacking routers by researcher Michael Lynn at the Black Hat hacking conference in Las Vegas.