contribution profit as revenues less cost of revenues and marketing expenses. We believe this is an important measure of our operating segment performance as it represents each segment's performance before discrete global corporate costs.



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For the Domestic and International streaming segments, content licensing expenses, which include the amortization of the streaming content library and other expenses associated with the licensing of streaming content, represent the vast majority of cost of revenues. Streaming content rights are generally specific to a geographic region and accordingly our international expansion will require us to obtain additional streaming content licenses to support new international markets. Other cost of revenues such as content delivery expenses, customer service and payment processing fees are lower as a percentage of total cost of revenues as compared to content licensing expenses. We utilize both our own and third-party content delivery networks to help us efficiently stream a high volume of content to our members over the Internet. Content delivery expenses, therefore, also include equipment costs related to our streaming content delivery network ("Open Connect") and all third-party costs associated with delivering streaming content over the Internet. Cost of revenues in the Domestic DVD segment consists primarily of content delivery, expenses related to the acquisition of content, including amortization of DVD content library and revenue sharing expenses, and other expenses associated with our DVD processing and customer service centers. Content delivery expenses for the Domestic DVD segment consist of the postage costs to mail DVDs to and from our paying members and the packaging and label costs for the mailers.



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For the Domestic and International streaming segments, marketing expenses consist primarily of advertising expenses and payments made to our affiliates and consumer electronics partners. Advertising expenses include promotional activities such as television and online advertising. Payments to our affiliates and device partners include fixed fee and /or revenue sharing payments. Marketing costs are primarily incurred by our Domestic and International streaming segments given our focus on building consumer awareness of the streaming offerings. Marketing expenses incurred by our International streaming segment have been significant and will fluctuate dependent upon the number of International territories in which our streaming service is offered and the timing of the launch of new territories. Marketing costs are immaterial for the Domestic DVD segment.



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We have demonstrated our ability to grow contribution margin as evidenced by the increase in contribution margin from 12% when we first began separately reporting Domestic streaming results in the fourth quarter of 2011 to 23% in the fourth quarter of 2013. As a result of our focus on growing the streaming segments, contribution margins for the Domestic and International streaming segments are lower than for our Domestic DVD segment. Investments in content and marketing associated with the International streaming segment will continue to