Thanks, Laura. I echo those comments.
Works that are paid for by the public are already the public's and should be easily accessible to use and be able to build, innovate and create on top of. We know that governments such as Australia's retain the copyright but publish works openly under a Creative Commons CC By licence, which means the government would continue to get attribution for the work being done, and allows for a broad reuse with minimum restriction.
We know that the European Commission has recommended open licences, the CC By and the CC0. CC0 is a licence that will apply public domain immediately to the licence. That's for publishing open data collected by public sectors and bodies within Europe.