Here is more info taking from a SEC filing from Cablevision:
In April 2005, subsidiaries of Cablevision and CSC Holdings entered into agreements with EchoStar Communications Corporation (“EchoStar”) relating to the launch and operation of the business of Rainbow HD Holdings, LLC, the Company’s VOOM 21 high-definition television programming service. Under those arrangements, EchoStar will initially distribute a portion of the Rainbow HD programming service and, beginning in 2006, if the contemplated transactions have been completed, will carry all 21 of the channels included in the Rainbow HD programming service. In connection with the arrangements, EchoStar would be issued a 20% interest in Rainbow HD Holdings, the Company’s subsidiary owning the 21 channels included in the Rainbow HD programming service, and that 20% interest would not be diluted until $500,000 in cash has been invested in Rainbow HD Holdings. The issuance of the 20% interest in Rainbow HD Holdings to EchoStar and EchoStar’s agreement to distribute all 21 of the channels included in the Rainbow HD programming service are subject to customary closing conditions, and the closing of the sale of the Company’s Rainbow 1 satellite to EchoStar.
Under the terms of our affiliation arrangements with EchoStar covering our VOOM 21 channels for a 15 year term, if we fail to invest $100,000 per year up to a maximum of $500,000 in the aggregate (which $100,000 amount may be reduced to no less than $38,000 if we decide in the future to reduce the number of channels) in the entity that owns and develops these channels, EchoStar may terminate the affiliation agreement. We have the right to terminate the affiliation agreement if the VOOM 21 service is discontinued in the future.