Michael Shields wrote:

> In article <[EMAIL PROTECTED]>,
> Marc de Piolenc <[EMAIL PROTECTED]> wrote:
>> The US Constitution prohibits ex post facto laws.
> 
> It seems to me that works could be removed from the public domain
> without passing an ex post facto law, as long as this hypothetical law
> did not affect 

derivative
^

> works created or copies made during the period between
> the expiration of the copyrights and the law's passing.

Which is pretty much what happened in the only case when some works fell out
of the PD due to a change in US law (the implementation of the URAA), though
derivative works faired poorly.


-- 
Peter Fairbrother

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