It does not cover Merc additions, nor does it cover Smaug additions. Those are derived works covered by a separate copyright which is licensed under its own terms.
Actually it can, If you agree with the terms of publishing, then you must license your work under the Diku license. This is exactly what the GPL does, it gives you the right to make derived works as long as it also made available as GPL.
You may wish to extend or enhance or make clearer the rights the Diku grants in your own license, but you cannot take away those rights.
Frankly the whole thing is murky and poorly-worded enough that I hesitate to say whether anything, regarding what is and isn't implied, is obvious...
I do agree with you, but the more i have thought on it, the more i see that this is a case of Engrish rather than a poorly written document. Anyone who is not from an english speaking background would relate to this sort of thing pretty well, where words and or ideas do not really make the transition well, now i don't know much about the original authors, have never met them, nor spoke with them, or corresponded with them enough to know how well their english is, but i have neibours who have been in australia for 40 years from finland who still use incorrect english words where to them it must be hard to process fin to english.
The words Profit and Income both can translate to the word ansio in fin which means
also the words Article and Object can be translated to the word esine which translates to
Does all this mean anything, HELL NO, but it has allowed me to see clearer the possible intent of those who created the licence. So what do i think this all means to me,
1. I can run free game that does receive any money
2. that i can create a derived work
3. that i can release a derived work that is subject to the terms of the diku
4. that i must give proper credit where it is due.
And while this might seem very clear to me, it does not mean that it is with others, so that Samson and I might just need to agree to disagree on this matter. At the end of the day no harm has been done, only that everyone has the interests of the original authors in mind. What i do have now is a really clear picture of what i would like to do with the next version of the Eldhamud license. I will post a draft for opions later if i get time.