Maybe I'll just contact them and ask :-)

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________________________________
From: Justin Mclean <[email protected]>
Sent: Wednesday, January 17, 2018 2:01:43 AM
To: [email protected]
Subject: Re: Interesting feedback from a potential user

Hi,

>  Also, it would be good if someone more familiar with reading legal texts 
> could have a look at the copyright notice at the bottom of this page (also 
> the root of the protocol spec): 
> https://infosys.beckhoff.com/english.php?content=../content/1033/tcadsamsspec/html/tcadsamsspec_intro.htm

I had a quick look (and I’m not a lawyer etc etc) but from what I can see it 
seems that as long as we respect copyright and trademarks it should be fine. 
You may need to take care re the patents. [1] This seem to make it clear [2] 
but sounds like there would be a few hoops to jump through, i.e. you may have 
to be a member to implement it.

Some other links that may be useful; the ADS spec [3] and this source code here 
[4] from Beckhoff Automation which is  MIT licensed.

> Another interesting thing I found out is that Beckoff PLCs are based on a 
> software PLC called CODESYS from a company called S3. This allows running a 
> PLC on Windows, Linux & Mac …

Sounds interesting.

Thanks,
Justin

1, 
https://infosys.beckhoff.com/english.php?content=../content/1033/tcadsamsspec/html/tcadsamsspec_intro.htm
2. https://www.ethercat.org/en/faq.html#787
3. 
https://infosys.beckhoff.de/index.php?content=../content/1031/tc3_adscommon/html/tcadsamsspec_amstcppackage.htm&id=
4. https://github.com/Beckhoff/ADS/blob/master/LICENSE

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