You can garner 85 % of all net royalties and retain 100 % copyright ownership of your literary works. (goodereader.com)
Also, the declaration of copyright ownership in your linked example shouldn't be taken as fact. (law.stackexchange.com)
No government would claim claim copyright ownership, except in the case that a government had received copyright for a work from some source (e.g. a donation). (law.stackexchange.com)