> The concept of relicensing does not imply changing or adding code, and
quoted text
> the legality of relicensing doesn't depend on changing or adding code.
> However, I would urge people to relicense only if they make very big
> changes.  If they make lesser changes, it is better to contribute them
> to the original project, and if they make no changes, relicensing is
> just silly (in most cases).
>

Public domain aside, in what other case would it be legal to change a
license, where no changes were made to the code, and the original
author has not granted permission?
certainly someone could not take BSD licensed code  and change it to
GPL if they have changed nothing and do not have the authors
permission.

keep in mind I have limited knowledge at best of software licensing

Sam Fourman Jr.