A coalition called Canada's Premium Audience Exchange (CPAX) said Thursday that four new companies have joined the exchange, which allows website operators to sell digital advertising in real time. CPAX said in a press release the companies joining the exchange are Postmedia Network Canada Corp., Yellow Pages Ltd., the Chronicle Herald and DHX Media Ltd. The group said that "the addition of these top publishers confirms that CPAX is leading the Canadian market as the best source for premium Canadian inventory at scale." The exchange is operated by 11 media companies including...
