I believe thats incorrect. as long as I sell the originals WITH the new work its not considered a seperate derivative work.
in fact is specifically states in teh copyright law that I am allowed to backup copy transcode my works but if I "sell" the original I must also INCLUDE or DESTROY any copy's backups or derivatives I have from those originals Not is allows me to INCLUDE them not only destroy I can do either.
the law is pretty clear on that part at least in the USA it is.
Chris Taylor
http://www.nerys.com/