66. No person, either personally or through another, shall canvass from person to person for the sale of courses or to obtain the signing of an engagement to follow such courses.
For the purposes of this section, canvassing does not include:(a) information given to groups of persons assembled in one place, provided that no engagement is signed at such place;
(b) the canvassing of an enterprise to organize courses that are offered without charge by such enterprise to its employees.