skunk said:
Now you're just being silly...
All my apps (all paid for) are backed up on all my Macs. I can only use one copy at a time. That's fair use as far as I'm concerned.
I don't know how the topic got here...
...but that's not what "fair use" is. "Fair use" only applies to the use of copyrighted materials under very specific conditions, furthering "the Progress of Science and useful Arts", e.g., in education (no, this doesn't mean it's ok if you're a student or go to school), parody, and other specific instances. "Fair use" seems to have gotten twisted around to what some people themselves *think* it is, not what it actually is.
Apple's Mac OS X license allows you to make backup copies of the CD and/or DVD media, and have it physically installed on one machine at a time. This can include internal or external backups on cloned volumes, etc., but still only includes one CPU. If you install Tiger for use on *another* physical CPU/system, even if you only use them "one at a time", this is a clear violation of Apple's license agreement, and as such, is likely in violation of some provisions of US law.
Whether or not you think EULAs can be enforced, whatever your opinion of copyright law, whether or not you're in the US, etc. etc. etc., are all beside the point. Apple, as the copyright and content owner, has made clear decisions about how it wishes the product to be used. You must purchase a license for EACH physical Macintosh computer Mac OS X is installed on. Now, if you feel okay buying one copy of Mac OS X and installing it on multiple computers, well, that's up to you.
But let's be clear: talking about the family pack is not at all "silly". Some people do feel an obligation to honor a good-faith agreement with a merchant; Apple has made a 5-license pack available for $199, and I don't think that's a bad deal at all. But deciding yourself that you're poor / it's ok because I already bought a copy / it's ok because I only use them one at a time / etc., it is still piracy from a technical standpoint, just on a different level. If you can justify it to yourself, hey, don't let me stop you. Knock yourself out.