There isn't. The High Court's decision on political freedom of speech is ridiculously limited in scope and doesn't apply to the vast majority of actions most Aussies would call "free speech". I also want to point out just how much the High Court has been forced to stretch the wording of the constitution in order to grant rights which are "obviously present" in our society:
* The amount of decisions which had a basis on "on just terms" had such a massive effect that almost every piece of legislation drafted in the past 50 years has a special provision saying that it should not be interpreted to violate the "on just terms" section of the constitution.
* The freedom of political speech comes from the High Court's reading of the preamble of the constitution, and the fact that it mentions Australia as being a representative democracy. They then ruled that in order for a representative democracy to exist you must have freedom of political speech. We're very lucky that our High Court is ruling in favour of the public's freedom rather than against it, because some people might see that as reason to question the legitimacy of the High Court (which would end very badly).
* The amount of decisions which had a basis on "on just terms" had such a massive effect that almost every piece of legislation drafted in the past 50 years has a special provision saying that it should not be interpreted to violate the "on just terms" section of the constitution.
* The freedom of political speech comes from the High Court's reading of the preamble of the constitution, and the fact that it mentions Australia as being a representative democracy. They then ruled that in order for a representative democracy to exist you must have freedom of political speech. We're very lucky that our High Court is ruling in favour of the public's freedom rather than against it, because some people might see that as reason to question the legitimacy of the High Court (which would end very badly).