On a contention that this clause was a restraint of trade, Porter J. held that restrictions placed upon an employee under a contract of service could take effect during the period of contract and are not in general against public policy. But the learned Judge at p. 1692 observed that a contract would be thought to be contrary to public policy if there were a restraint, such as a restraint of trade, which would be unjustifiable for the business of the claimants in the case. He however added that he did not know of any case, although it was possible, there might be one, where circumstances might arise in which it would be held that a restraint during the progress of the contract itself was an undue restraint. He also observe that though for the most part, those who contract with persons and enter into contracts which one might for this purpose described as contracts of service, have generally imposed upon them the position that they should occupy themselves solely in the business of those whom they serve but that it would be a question largely of evidence how far the protection of clauses of that kind would extend, at any rate during the existence of the contract of service. Therefore, though as a general rule restraints placed upon an employee are not against public policy, there might, according to the learned Judge, he cases where a covenant might exceed the requirement of protection of the employer and the court might in such cases refuse to enforce such a covenant by injunction. In William Robinson and Co. ltd. v. Heuer( I) the contract provided that Heuer would not during this engagement without the previous consent in writing of William Robinson & Co., "carry on or be engaged directly or indirectly, as principal, agent, servant or otherwise, in any trade, business or calling, either relating to goods of any description sold or manufactured by the said W. Robinson & Co. Ltd., .... or in any other business whatsoever." Lindley M.R. there observed that there was no authority whatsoever to show that the said agreement was illegal, that is to say, that it was unreasonable or went further than was reasonably necessary for the protection of the plaintiffs. It was confined to the period of the engagement, and meant simply that "so long as you are in our employ you shall not work for anybody else or engage in any other business". There was, therefore, according to him, nothing unreasonable in such an agreement. Applying these observations 8ranson J. in Warner Brothers Pictures v. Nelson(Z) held a covenant of a similar nature not to be void. The defendant, a film artist, entered into a contract with the plaintiffs, film producers, for lifty-two weeks. renewable for a further period of fifty-two weeks