As a condition of my employment, I retain the copyright arising in my works whether produced in the course of my employment or through my use of employer provided facilities. Any such works that I deliver to my employer, will be provided under one or more non-exclusive licenses of their choice from FSF, OSI or CC. Cases of joint authorship may be negotiated separately, however, I will not be excluded from my intellectual work nor be alienated from my liberty to utilise or communicate it.

That’s not so much safeguarding the liberty of the public so much as that of the employee (though it still doesn’t address its derogation by patent). One could arrive at conditions that would restore the public’s liberty to the employee’s work (the public includes the employee), but that probably reduces the employment prospects somewhat. For such employees able to assert their principles I daresay conditions of employment will be negotiated individually, probably stipulating the use of GPLv3 or CC-SA. But then they’d probably only work for an employer that upheld similar principles already.