According to rule 8:
“by submtting a game ot the contest, Contestant hereby grants…a license to post (or link to) the game.”
So you really SHOULD read the rules! You are providing Sun a license to give away your game for free by entering. I doubt they’d be particularly pleased if you turned around and said “ha ha! Yes you can give it away, but it can’t be played without the registration keys I have which are secret!”. Lawyers could argue over it, but it looks like the intent is that Sun can distribute whatever they’re judging (which is fair enough! And standard practice for these compos IIRC…). If you go on to make a bigger version with extra levels and start selling it, fine.
Shrug. Personally I still wish it banned games that had been “years in the making” in the interest of fairness. (i.e. if your game was largely written before the competition even started then it’s all a bit silly IMHO…If the compo had been announced something sensible like a year in advance, then fair enough, but it was only 2 months!).
Although, from checking just now, it looks like Alienflux is allowed to enter - assuming a game was not published by an “ineligible publisher” it doesn’t seem to matter how old it is. I guess they’re trying to bring out of the closet any and all games written in java that have been published to date, and get them all to run out into the open ???