Perhaps the most important issue of all is one that does not fall comfortably into any of the above categories, but impacts them all - rights management.
At Rights Tracker we're working on an API to enble rights for video across the internet. Indeed, we hope that this will become the real 'tv everywherel whereby anyone who has bought a right will be able to authenticate it on any device or medium in any format.
This is already what the software does for major TV rights owners in the UK. Now we're taking the genie out of the bottle...
