About AmsDOS & CPC Firmware :

You can redistribute copies of these copyrighted code as long as

a) copyright messages are not changed
b) either in the program or the documentation you acknowledge that
   "Amstrad has kindly given it's permission for it's copyrighted
   material to be redistributed but Amstrad retains it's copyright."

More details at : http://web.ukonline.co.uk/cliff.lawson/cpchomec.htm


About the CPC BASIC, it is copyright Locomotive software.