OzPunter
Just to clarify my last post. It has nothing to do with infringing rights. I was thinking about costs to the programmer.

Betfair intention was that if anyone wrote a program (a user interface) that was going to pass bets to the Betfair API then Betfair wanted a royalty for each program sold. If your program was only to download prices then no royalty would be sought.

In short, the user (punter) pays for the API and your interface program can download prices through it at no cost to you - the programmer. But if your program can pass bets back through the API then you had to pay a royalty - which is when a vendor ID was to be included in the bet stream.

It may be just academic now because that was a couple of years ago and Betfair may not have gone ahead with royalty requirement. I thought it was a bit greedy at the time.


Regards
Debug