Why do they need a non random code to generate these? If they want to guarantee the number of winners, they can just ensure that they only release so many winners. This would require them "solving" all the tickets they were to release and holding/deleting/regenerating the ticket if they have enough winners already.
This may not be the most efficient system but it guarantees it isn't crackable with a couple of caveats:
1. They weren't always releasing a winner at a fixed time - i.e. they had to have x win per week, and they released a winner at regular intervals to guarantee separation. You don't want all the winners for a month produced in the first hour. Although this would be random and should be a possibility.
2. The random number generator was actually random.
This may not be the most efficient system but it guarantees it isn't crackable with a couple of caveats:
1. They weren't always releasing a winner at a fixed time - i.e. they had to have x win per week, and they released a winner at regular intervals to guarantee separation. You don't want all the winners for a month produced in the first hour. Although this would be random and should be a possibility.
2. The random number generator was actually random.