..... how can canon, nikon and co. keep their secrets?

i mean... we see software on the internet before it is released.
some employees stealing retail copys or even master CD´s.
games, blu rays or software are one the web before they hit stores.

don´t get me wrong i don´t support this.. i just say it as it is.

but there is no leaking from inside canon or nikon as it seems.
what we read here on CR is more often wrong then not.

ok many who could leak infos are under NDA. most will not risk violating the NDA, sure.

but you have to produce flyers, press material etc.
there must be people who have not signed a NDA who come in contact with these new products long before announcement... or not?