Jimmy Kaplowitz writes ("Re: volunteer copyright assignment / licensing agreement"):
> You probably shouldn't list SPI as copyright holder when nobody's assigned
> copyright to SPI.
I think if the original author or copyright holder writes a copyright
notice saying that SPI is the copyright holder, then that is a legally
effective copyright assignment. At least in the UK[1].
[1] http://www.legislation.gov.uk/ukpga/1988/48/part/I/chapter/V
Ian.