Interesting discussion! If you produce an embedded system product that has, say, a custom application running on a GPL operating system or making calls to GPL libraries, how much source code must you release? Do you need to release the source code of the custom application, or just the open source stuff that you are including unmodified? Harold -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist