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Doesn't this answer the question?
No. These clauses, in brief, deal with legal issues and the protection of MQ's interests, such as: prohibiting users from posting third-party copyrighted or other rights-protected material, the user's agreement that he/she grants a permanent irrevocable non-exclusive right to use the user's MQ material.
It does not say anything about the topic of the thread.
Legal issues and MQ protection are considered
Yes, it means that the author's rights are not infringed in any way. And the author of the sources which placed the code for public use has the right to indicate the type of the license in the source code himself. BSD, MIT, LGPL, GPL, etc.
If not to bother at all, it is enough to write "this software is public domain" in the comment at the top and this code can be used as you wish in proprietary software. Or indicate BSD license, and the author of non-free software must indicate the author of the sources in the product description.
By Googling, I think I found that not mentioning the license does not give the right to copy somebody else's code into one's own program.
It is also possible to negotiate a commercial license with the author of the code, as for example the authors of ALGLIB do
https://www.mql5.com/ru/code/1146
Yes, so the author's own rights are not infringed in any way.
It's not that the author's rights are not infringed (they should be!), it's that they are not protected in any way. You can do MQ very simply - to specify in the agreement in the code base, that the user, the author of the source code, must specify in the description of the code on the site page the license under which he distributes the program.Well, the point is that those who care can (and some do). Unlicensed code remains the property of the author (All right reserved)
Here is an interesting linkhttp://www.opennet.ru/openforum/vsluhforumID3/87570.html
Actually, the question is, under what licence are the codes presented in the database?
By the way Copyright: blabla All rights reserved is in every EA, so there is a ban on embedding code into third-party applications -https://ru.wikipedia.org/wiki/All_rights_reserved
I think the subject is closed.)
P.S. And all products based on kodobase sources (if it can be proved) from Market should be removed)