I know the folks at Plaintextures have explicitly allowed use in the past.  Can you confirm that this is the case for the textures you've used here?

Thanks!

Bart

I am sure he can find a lot of newyorkers on reddit who claim to be industry professionals.

I was responding to his second question, not his first.  That said, a lot of indie game developers hang out on r/gamedev, so he may actually have some luck there.

I just tweeted about it, for whatever good that will do. ;)

Do these require a constant internet connection to use?  ;)

Sorry, EA joke.  Nice tileset.  :)

Just to avoid a couple bits of confusion:

• Jailbreaking your telephone is still completely legal in the United States.  What is illegal is unlocking your phone, which has to do with being able to change carriers.
• Both CC-BY-SA and CC-BY have an anti-DRM clause which (as I understand it) prevents those works from being released on the apple app store.  I personally take issue with this provision in CC-BY, since it's kind of a gotcha clause in that case.  They either need to remove it or add a note to the license deed to clarify that it's there.
• The people who made the base assets have agreed in the past to allow those assets to be used in iOS games, although at the moment people will need to get individual permission from the artists on a per-game basis.  We're working on getting blanket permission from all of them.
• It is completely up to the individual entrants whether they want to make their work CC-BY (and additionally allow it to be used with DRM) or not.  I personally find Apple's behavior in this regard absolutely obnoxious, so I completely support anyone who doesn't want their art used in apps on the app store.  This is, to reiterate, a problem with Apple, not the artists or the licenses, and, while I am personally fine with my own CC-BY art being used in a DRMed game, it's not my place to speak for others on this matter.

At any rate, this isn't about being vindictive ("screw Apple").  Apple has a lot of organizational inertia, and they obviously care very little about Free Software or the Creative Commons.  They're not going to change just because people have asked them to (they've been asked, they declined).  The only way they're going to change is if they get a significant volume of complaints from their customers.  If you haven't complained to Apple about these practices and how they affect your game development already, I would strongly suggest that you do so.  It's not fair just to complain to the artists.