The Kaspersky Security Network published statistics for the third quarter of 2012 showing that 47.5% of its users were affected by one or more critical vulnerabilities. The report also highlighted that "Flash Player vulnerabilities enable cybercriminals to bypass security systems integrated into the application." Steve Jobs criticized the security of Flash Player, noting that "Symantec recently highlighted Flash for having one of the worst security records in 2009". Adobe responded by pointing out that "the Symantec Global Internet Threat Report for 2009, found that Flash Player had the second lowest number of vulnerabilities of all Internet technologies listed (which included both web plug-ins and browsers)." On April 7, 2016, Adobe released a Flash Player patch for a zero-day memory corruption vulnerability that could be used to deliver malware via the Magnitude exploit kit. The vulnerability could be exploited for remote code execution. Vendor lock-in Flash Player 11.2 does not play certain kinds of content unless it has been digitally signed by Adobe, following a license obtained by the publisher directly from Adobe. This move by Adobe, together with the abandonment of Flex to Apache was criticized as a way to lock out independent tool developers, in favor of Adobe's commercial tools. This has been resolved as of January 2013, after Adobe no longer requires a license or royalty from the developer. All premium features are now classified as general availability, and can be freely used by Flash applications. Apple controversy In April 2010, Steve Jobs, at the time CEO of Apple Inc. published an open letter explaining why Apple would not support Flash on the iPhone, iPod Touch, and iPad. In the letter he blamed problems with the "openness", stability, security, performance, and touchscreen integration of the Flash Player as reasons for refusing to support it. He also claimed that when one of Apple's Macintosh computers crashes, "more often than not" the cause can be attributed to Flash, and described Flash as "buggy". Adobe's CEO Shantanu Narayen responded by saying, "If Flash [is] the number one reason that Macs crash, which I'm not aware of, it has as much to do with the Apple operating system." Steve Jobs also claimed that a large percentage of the video on the Internet is supported on iOS, since many popular video sharing websites such as YouTube have published video content in an HTML5 compatible format, enabling videos to playback in mobile web browsers