The BBC introduced specially crafted web bugs, referrer checks and download chunk limits, such that only devices exhibiting this behaviour, i.e. a genuine iPhone handset, would be able to stream the video content. A cycle of updates and reverse engineering has followed such that all the various streams, both for the iPhone and Flash streaming service, are now able to be downloaded without the need for decryption or DRM circumvention. This has been made possible by various software which can effectively simulate a RTMP Flash client or an iPhone. In early December 2010, the iPhone MP3 access was being changed to use HTTPS. The server checks the client's certificate and only accepts connections for those issued to Apple. This change to the protocol not only prevents access to non-Apple devices but also disables use by a number of early generation iPod Touch devices.