Later compression technology, implemented in codecs like MPEG4, H.264 or VC-1, can enable a substantial increase in either quality or capacity due to their increased efficiency, but use of such technologies would again require most viewers to purchase new reception equipment, since the vast majority of standard set-top boxes support only the older MPEG2 encoding. BSkyB were the first to suggest such a move to increase the number of channels available within their own share of space using MPEG4 on a subscription service. However, BSkyB's proposals were ultimately shelved following regulatory delays.