What does it have to do with links? Now I am under impression that you do not understand GPL licence correctly or trying to avoid it.
In
https://en.wikipedia.org/wiki/GNU_General_Public_License the first paragraph clearly states, that:
The GNU General Public License (GNU GPL or GPL) is the most widely used[5] free software license, which guarantees end users (individuals, organizations, companies) the freedoms to use, study, share (copy), and modify the software.
Which users of your admin client simply can not do if you do not provide sources. What is more explicit breach of OpentTTD GPL licence?
The fact, that client is not public, but is reserved for only narrow circle of users is totally not the issue here. Even if you provided privately for one person, you have to include source. So please do not give us a giberrish about some not public links.
Now, you abandoned doing admin client for some admins around N-ice, and because you broke the licence and have not included sources, they are without the client.
This casts an interesting light on your debate with xOR here on forum
http://www.n-ice.org/openttd/forum/index.php?topic=361.0Clearly, I must admire N-ice admins, that they have not been aware of GPL licence and have not drawn your attention to that, as you probably do not understand it. Also I am quite puzzled why they have not wondered about your intentions to not provide the sources. Now I see you builded around here the image of generous guy, who is always at hand, and I can see you contributed to both N-ice and BTpro very much, but to independent observer, some of your actions are puzzling.
Now I am from Novapolis aka former Luukland's Servers, so before anyone would want to start charging me of doing the same, read the debate about this issue in here
http://www.tt-forums.net/viewtopic.php?f=29&t=46268#p839895I am sorry about making some strong statements here, but I need to set that clear.
Also it is of course ok, that you stopped doing admin client for N-ice, or more accurate, for some of N-ice admins. I offered a helping hand to xOR and promised him I will do n-ice admin client for a while. But it would be much easier for me, if you have not played a trick or treat here and included the diff, so I could just compile it and not have to rewrite whole code.