Hi SeaEagleRock8 hope you are well.
Mate, in regards to authorities that maybe relied upon to substantiate freedom of expression there are numerous....
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DPP v Kaba [2014] VSC 52 Bell J talks about this at lengths and Australia's responsibilities to the International Covenant on Civil and Political Rights (ICCPR) see paragraphs 90-94 in his decision.
Entry into force: 23 March 1976, in accordance with Article 49 Preamble The States Parties to the present Covenant, Considering that, in accordance with the principles proclaimed in the Charter of the United Nations, recognition of the inherent dignity and of the equal and inalienable rights of...
www.ohchr.org
See ICCPR Article 18 & 19 and particularly Article 50
www5.austlii.edu.au
Victorian Charter of Human Rights and Responsibilities Act 2006 s14 & s15
Constitution
COMMONWEALTH OF AUSTRALIA CONSTITUTION ACT - SECT 118
Recognition of laws etc. of States
Full faith and credit shall be given, throughout the Commonwealth to the laws, the public Acts and records, and the judicial proceedings of every State.
Section 118 provides assistance to use the Victorian Charter of Human Rights in states that do not have a Charter.