[PythonicAlpha]

If he is not the same author, then you are right. One statement from an other poster suggested, that he is.

The original author would have the right to add new alternative license conditions as he wishes to.

Maybe the author of 3D City should say something about it.

Edit: Now I saw, what you mean. MicropolisJS seems to be an alteration of the GPL'ed Micropolis of an other author. And the owner of MicropolisJS stripped the GPL license from it to use it in the other project (btw. why?). I am no lawyer, but it really looks to me as a violation of the GPL, at least without permission of the first author.

[bhouston]

The author of MicropolisJS is not the author of the ThreeJS SimCity clone that is the top of this HW story.

[DonHopkins]

It's not a clone, it's derived from the original SimCity source code, which EA licensed under GPL V3 with the added condition that it should not be called "SimCity" without EA's approval. So it's important that all versions of the code include that license and the required provisions.

http://donhopkins.com/home/micropolis/olpc-ea-contract.pdf

https://code.google.com/p/micropolis/wiki/License

2.1 Modification. EA hereby grants to OLPC a non-exclusive, non-transferable, non-sub licensable, non-assignable, revocable right and license to modify the Original SimCity as provided by EA for the sole purpose of producing a version of the Original SimCity for distribution on laptops provided through the OLPC Program pursuant to the specifications set forth in Exhibit A ("OLPC SimCity"). All right, title and interest in OLPC SimCity and any interim modifications shall belong solely to EA. OLPC SimCity, and any subsequent versions, will not be distributed by OLPC unless the software meets the requirements set forth in Exhibit A. For the avoidance of doubt, nothing contained in this Agreement shall be deemed to limit or restrict EA’s right to use, modify, sell, distribute or license the Original SimCity in any other manner as EA so desires.

And on a completely unrelated topic:

Q: How do you know there's an elephant hiding under your bed?

A: Your face is pressed up against the ceiling!