> As long as it is separate binaries that is usually considered a "mere > aggregation". > Even a frontend calling them via the command line is not considered a > "derived > work" under the GPL. Which is the case for "intrusive" ways which still do > not > involve direct linking probably will only be decidable by a judge. I have never appreciate the wisdom of this. What it seems to say is: you can use [GPL software] as part of your program, but you must do it in a backward and inefficient manner. Most users will not understand this distinction, and in the case of a frontend calling the executable behind the scenes, will not even be aware that there is a distinction to be made. Really, who does this help? P