The binding legal principles established are: (1) Section 42 of the Trade Marks Act 62 of 1963 applies to defensive trade marks registered under section 53 of that Act; (2) Section 42 survived the repeal of the 1963 Act through the operation of section 70(1) of the Trade Marks Act 194 of 1993, to the extent that it determines the validity of the original entry of a trade mark on the register; (3) The 'date of registration' for purposes of section 42 is the deemed date under section 37 of the 1963 Act (the date of lodging of the application), not the actual date of registration; (4) After seven years from the deemed date of registration, the original registration of a trade mark in Part A is taken to be valid in all respects (subject to the exceptions in section 42), and this bars applications for removal based on grounds relating to original registration; (5) The registrar's opinion under section 53(1) of the 1963 Act is the jurisdictional fact for defensive registration, and parties who do not appeal the registrar's decision cannot subsequently challenge the opinion in separate proceedings without attacking the existence of the opinion itself.