For shoutcast you have to buy a shoutcaster Basic Broadcaster License Key from winamp.
Is this for use on 1 station of can i use this license for all streams?

Or is er a company key for comercial use so that not everybody have to buy this?

Ron

We at Centova are not involved with Nullsoft's licensing procedures so all I can do is repeat what I've heard, but I believe DrO commented on a prior thread here that while it's probably technically possible to use the same key on more than one stream, you're legally supposed to have a separate key for each stream.

As for company/reseller keys, I'm not aware of such an option but maybe DrO can comment if he notices this thread.  This has been asked on a couple of other threads though so you might want to search in case he replies to one of the others.

do i need the key to encode in centova in mp3?

yes acc is for free mp3 needs a key