IANAL, but I believe whether he’s selling it or not has no bearing on the legality of sharing it. Copyright does not depend on selling.
It may have a bearing on your evaluation of the ethics of sharing it illegally.
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Hm, it does have a copyright notice in the front matter of the PDF. I’ll see if I can get in touch with him. I’ve been meaning to reach out and offer to clean up the PDF.
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And another one:
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That World Radio History website is awesome, Ive visited many times, mainly for the electronics magazines but also some interesting old stuff about radio and broadcasting in general.
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Not sure whether this has been posted somewhere already, but certainly worthy a repost:
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Well @Jos, thank you.
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Today I’ve reached 20 repositories on github, so … maybe it is time to add my own here as well?
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SDIY Building Blocks Is a fantastic site
Thank jos 
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YAMSR ( Yet Another Modular Synth Repository ) !
This one is by m0xpd aka Paul Darlington.
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When I started this thread, there were not many repos known to me that contained interesting builds. However this being the 151 th post, I’ve come to realise that there are plenty.
Here is one by mzuelch and It contains quite a few sub repositories.
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This one has unfortunately gone offline that past month.
I’m not sure what you mean, the link is still active.
https://looklook.tv/sdiy/ gives me a 404 error.
Oh, I thought @K.ostas was referring to my latest post i.e. the mzuelch link.
I can’t get to the sdiy repo either at the moment.
It’s been dead for at least a month. No trace of it in archive.org either. I recall some (but not all) of the circuits were at github though.