The number of households worldwide subscribing to pay TV services will continue to increase at a compound annual growth rate of about 3.2 percent through 2013, according to research firm Analysys Mason. However, IPTV services will have CAGR of 15 percent over the same period, and research suggests that IPTV's success is beginning to take a bite out of the pay TV market. The study adds to mounting forecasts and market evidence that the regular free broadcast market segment will not be the only segment to suffer from IPTV's success. Pay TV has been big business in the U.S. and elsewhere for almost 30 years as pay TV broadcasters have used shrewd marketing and cable and satellite partnerships to their benefit. Still, while IPTV is beginning to have a competitive effect in some countries, pay TV may continue to reign in countries such as Russia, where IPTV penetration remains small. See this story at Vnunet.com and check out this coverage at IPTV News