Bringing up the Creative Commons in this respect is sort of undermining your own argument. CC0[1] is a license acknowledging that, while it may be legally impos

Bringing up the Creative Commons in this respect is sort of undermining your own argument. CC0[1] is a license acknowledging that, while it may be legally impossible to voluntarily and irrevocably extinguish copyright in works in which copyright naturally subsumes (putting a work into the public domain proper), as is the case in Canada under the Copyright Act (R.S.C., 1985, c. C-42), to the extent possible under law, you make a grant of license equivalent to usage rights for works in the public domain. The results are similar, but the universal grant of license is revocable within the lifetime of the copyright (that is, the license may be withdrawn, and use after the withdrawal that is not ongoing from the period of the license would be subject to explicit grants of license).