> How is the Layout defined??? What do you mean by "defined?" Are you trying to ask, "what does the bootable OpenBSD CD ROM file system contain?" If yes, then you can look at an official OpenBSD CD ROM to see the arrangement of files and directories.
> If the md5 sum of the ISO image of a custom made OpenBSD CD is > different form that of the md5 sum of the ISO image of official CDROM > then can it be considered different in lay out??? It would have to be different in layout, or have no/different packages on the CD ROM file system. Do you know what MD5 is and what the purpose of hash algorithms are? There's no copyright issue in your question, unless the custom CD image is being distributed. You can make a CD ROM ISO image from the files on the FTP site. Theo makes everything available that you need to make bootable CD ROM images for your own private use. Read the FAQ entry again, and then 'man mkisofs' and 'man cdrecord' or somesuch, e.g. Google them. By the way, your question mark key keeps getting stuck. Unless you're trying to annoy readers intentionally. :-)