Electronic Program Guides

[robbytein]

I'm just doing some research on on EPGs

I'm just wondering if anyone could point out any websites or resources where I could find out more information about how they work.

E.g the technology and companies behind them.

I've found a little bit of information on Wikipedia:
e.g: http://en.wikipedia.org/wiki/Electronic_program_guide
and about Guide Plus from Gemstar:
http://en.wikipedia.org/wiki/Guide_Plus

Specifically I'm interested in how the information is put into the database (I assume its done by the broadcasters themselves) and then how this is centralized.

BDSI and Tribune are just two of the players. Sky do their own.

[robbytein]

Yeah I think NDS do Sky's EPG.

Does anyone know how the information gets into the EPG in the first place and what the processes and procedures are for that?

Theres a company that looks after Skys EPG system, but I can't remember who it is. NDS look after the system downstream of the EPG data, but they don't actually do the EPG gathering system.

EDIT : It might be BDS for the epg for sky.