The post FMT303: Property Law Question 1 The cardinal principle of the Torrens system is the indefeasibility of those estates and interests which are registered under the Land Titles Act. The Act specifies the estates and interests which are registrable. Those which are not registrable but are recognized under the general law can be protected under the machinery of caveats. Examine such caveatable interests with references to local cases (if any). Demonstrate the following: (a) effects of lodging a caveat; and (b) challenging the caveat. first appeared on Your Answers.