This demo is not a real video-streaming service but it does demonstrate several aspects of IRMA. When you become IRMATube “member” you receive a membership card in your IRMA app. Subsequently, you can use the data on this card to watch (trailers of) movies on the IRMATube main page.
In particular, the IRMATube demo illustrates the following.
Upon becoming member of IRMATube you receive two pieces of data in your card: one which simply proves that you are a member, and one which contains a personal membership number. When you wish to watch a movie, only your membership is requested, not the membership number that identifies you: you only prove that you are a member, not who you are.
In a more elaborate and realistic scenario you may want to reveal your membership number too in case you want a movie to be added to your personal profile (built-up by the video service). That is not included in the current version of the IRMATube demo.
Some of the movies on IRMATube have an age limit. When you wish to watch those movies, you have to reveal not only your IRMATube membership, but also your age limit data. (Cards for such data can be obtained from the municipality or from the bank.)