> 
> So I do have a 52K PCAP file that I can mail if anyone wants 
> to have a look but the ports are wrong for the online 
> decoder, and it seems pretty clear that there's funny vendor 
> specific stuff going on- manual decoding is error prone, but 
> the initial packet sent from client to reader is only
> 114 bytes and I've taken a fair length of time decoding and 
> checking it, especially around the stuff that doesn't make 
> sense. I was worried that my understanding was way off, so 
> it's reassuring having other people say it seems odd.

I've update the online decoder so you can now specify the port numbers.
If it sees something non-standard, it'll still deecode everything around
it and dump the non-standard stuff in hex.  Give it a whirl.

> 
> The problem is that my boss isn't happy to have open source 
> stuff because of the issues of copyright breach on the one 
> hand and the perceived requirement to open source anything 
> that in any way uses open source stuff. I went down the route 
> a couple of years back to use a lovely library of little 
> utility routines and even had email assurances from one of 
> the lead contributors that the license it was under (LGPL) 
> allowed us to call the libraries without opening our code. 
> Didn't help, so I have to periodically reinvent the wheel.
> 
> Since there's substantial cost to re-inventing the wheel, 
> I'll make another attempt. If I joined the dotnet effort what 
> would be the implication? I assume the toolkit will be done 
> as a seperate DLL or assembly that can be called by our closed code?
> 

It sounds like that perception is based on GPL.  LTK is not under GPL,
it is under the Apache License.  
http://www.apache.org/licenses/LICENSE-2.0
I can't (and shouldn't) stand in for your legal counsel, but you should
read that license prior to making your attempt at convincing your folks
to join the effort.




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