Abplanalp, a five-year employee of Com-Co Insurance, signed an employment agreement including a restrictive covenant providing that, should he leave Com-Co, he would not use Com-Co customer lists or solicit business from Com-Co clients for three years. Abplanalp moved to Service Insurance, where he sold insurance to some friends and relatives. He did not sell to any other persons whom he came to know while working for Com-Co. Abplanalp was sued by Com-Co for violating the restrictive covenant. Decide. Explain.