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If this version of this amp is really violating the copyright license of the O2 then Massdrop needs to stop selling these. I would not trust the performance.
The Objective 2, as well as the ODAC, are open source designs. The designer, Northwest AV Guy, created them and released the blueprints under creative commons so anyone can make these themselves. Both Mayflower Electronics and JDSLabs makes a version of this amp, and as long as they follow the exact blueprints released under the Creative Commons license there is no issue. You can build one yourself if you want, but for many it is easier to buy one made by someone else due to time or technical skills.
No derivatives. They changed some of the parts according to the top post.
JDSLabs also makes the same modifications to the O2, and if I'm not mistaken Mayflower also does too. I don't recall the reasoning behind being able to make those changes at the moment, but I believe that it was allowed. Sticking the ODAC into the O2 as a combo unit was the first change, as the O2 has a spot for a 9-volt battery for mobile use that perfectly fits the ODAC. I'll check into it further, as I'm on mobile now, but if this isn't allowed then every manufacturer is guilty of it.
Since the dude basically vanish from the face of the earth. Who is going to come after those that sell it?