So, once the modified clone(s) start to get a foothold in the market, release a new version of the OS which checks for the existence of the copyrighted marker:

So, once the modified clone(s) start to get a foothold in the market, release a new version of the OS which checks for the existence of the copyrighted marker: http://en.wikipedia.org/wiki/Apple_ProDOS#Unlicensed_Apple_II_clones http://en.wikipedia.org/wiki/Apple_ProDOS#Unlicensed_Apple_I...