What is the relationship between to and video on demand in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Premium subscribers, however, receive value add services such as, video on demand services which include: Catch Up: for newly aired movies and the latest episodes of TV shows, BoxOffice: to rent movies via your decoder with no Internet connection required, BoxOffice and Catch Up Online: to rent movies and Catch Up online, DStv Now: to view live TV via the internet and SuperSport Live: to view live sports over the internet.

Answer: distribution_format