I'm wondering what permits/licences would be required for a game of skill competition available for entries worldwide. There would be an entry fee, which will be used to fund the competition. The prize pool would work on a sliding scale, dependent upon how many entries are received. For example, the initial prize might be $500 cash, but upon reaching 50 entries it might go up to $1,000. This would continue to go up with the entries, with extras such as physical items being added, to the point of including a holiday to the winner. Depending upon how many entries are received, the prize pool could potentially reach a value of over $5,000. My question is: what do I need to get in order to ensure this is legal and do I need to be aware of any legalities under Commercial Law? Since $5,000 is a bracket used in raffles and trade promotions, I would appreciate if suggestions could be given on situations for both under and over $5,000. Thanks in advance.