Movie not playing on macbook air as non HDCP compatible display?

I have a 13" Macbook air which is 18 months old.

Today I tried to play Planes Fire and Rescue on it but was presented with the error:

"The movie can only be played on displays that support HDCP"

I am 99% sure I have played this movie on my laptop before without an issue.

Itunes was updated to the latest version for me on the 7th of February and I am thinking this is part of the problem?

Any tips?

Cheers

Adam