This trend continued with the launch of Eurobird 1 (now Eutelsat 28A) in 2001. Additionally, some channels occasionally received new numbering — However, in early 2006, the majority of channels received new numbering, with some receiving single digit changes, whilst others received new numbers entirely. Sky is currently transmitted from the Astra satellites located at 28.2° east (2A/2C/2E/2F) and Eutelsat's Eutelsat 28A satellite at 28.5°E. Standard definition broadcasts Sky's standard definition broadcasts are in DVB-compliant MPEG-2, with the Sky Cinema and Sky Box Office channels including optional Dolby Digital soundtracks for recent films, although these are only accessible with a Sky+ box. Sky+ HD material is broadcast using MPEG-4 and most of the HD material uses the DVB-S2 standard. Interactive services and 7-day EPG use the proprietary OpenTV system, with set-top boxes including modems for a return path. Sky News, amongst other channels, provides a pseudo-video on demand interactive service by broadcasting looping video streams. Digital satellite receivers Sky utilises the VideoGuard pay-TV scrambling system owned by NDS, a Cisco Systems company. There are tight controls over use of VideoGuard decoders; they are not available as stand-alone DVB CAMs (conditional-access modules). Sky has design authority over all digital satellite receivers capable of receiving their service. The receivers, though designed and built by different manufacturers, must conform to the same user interface look-and-feel as all the others. This extends to the Personal video recorder (PVR) offering (branded Sky+). Electronic programme guide Technology Sky maintains an electronic programme guide (EPG) which provides information about upcoming programmes and a list of channels. Channels available on Sky are assigned a three digit logical channel number which can be entered on a remote control to access the channel and determines in what order channels are listed. The EPG in Ireland gives priority to Irish channels. All channels are grouped into categories depending on their content. What section of the EPG a channel gets allocated is determined by rules set up by Sky Ireland. Sky Ireland has no veto over the presence of channels on their EPG. Any channel which can get carriage on a suitable beam of a satellite at 28° East is entitled to access to Sky's EPG for a fee. Third-party channels which opt for encryption receive discounts ranging from reduced price to free EPG entries, free carriage on a Sky leased transponder, or actual payment for being carried. However, even in this