Is China DTV spec open or closed?

The article presents issues about the status of digital terrestrial television (DTV) standard in China. Some companies claim that the standard is closely guarded by one or two local companies, but other insists that it is open to the public. Siano Mobile Silicon Ltd. and DiBcom allege that the standard, known as Digital Media Broadcasting-Terrestrial, (DMB-T), is not as open as one might think, the reason why it would not support it as an alternative to satellite for mobile phones.