text: Our intangible assets have increased mainly because of acquisitions. We 
  amortize the cost of 
  their 
  estimated useful lives. We use judgment to determine the life of these 
  assets, analyzing all relevant factors, including the expected usage of 
  the asset, the typical life cycle of the asset and anticipated changes in 
  the market demand for the products and services that the asset helps 
  generate. 
  
  intangible assets with finite lives over 
  
  All 
  internal control systems, however, no matter how well designed, 
  have inherent limitations, and even systems that have been determined 
  to be effective can only provide reasonable assurance about 
  the 
  preparation and presentation of financial statements. 
  
  We do not amortize intangible assets with indefinite lives (spectrum and 
  broadcast licences) because there is no foreseeable limit to the period 
  that these assets are expected to generate net cash inflows for us. After 
  review of the competitive, legal, regulatory and other factors, it is our 
  view that these factors do not limit the useful lives of our spectrum and 
  broadcast licences. 
  
  CHANGES IN INTERNAL CONTROL OVER FINANCIAL 
  REPORTING AND DISCLOSURE CONTROLS AND 
  PROCEDURES 
  There were no changes in 2013 that materially affected, or are 
  reasonably likely to materially affect, our internal controls over financial 
  reporting. 
  The table below shows the impact that changing the useful lives of the 
  finite-lived intangible assets by one year would have on annual net 
  income: 