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> Apologies, I don't know much about (disassemblers for) modern ISAs; I'm mostly aware of "dumb" assembly languages used in the 70s and 80s, before macro assemblers, instruction modifier prefixes, instructions with opcodes that change based on argument types, etc.
I was literally thinking about assemblers from the 80s, which are _anything_ but dumb. If anything, it is _todays_ assemblers which may be dumb. Just think how many 8086 assembler kits there were (and are) and whether their syntaxes resemble each other at all. Now single MASM itself and think of how many million ways you have to create a program that builds to the same object code, whether you use macros or not. (Did you use .if or CMP?)
> it definitely did to whatever assembly language the IBM bootloader was written in.
No. Just no. We have assembly listings of the IBM BIOS. Even the first line of it may be different depending on whether you use DW or DB and still compile to the same machine code.
> There are no "technological measures" used to protect IP rights (i.e. DRM) in these older works;
This is also wrong, because _there are_. We literally discussed 10NES which is one such method for a console two generations older, and you can see the ones from Paper Mario 64 right in the decompiled source: https://github.com/pmret/papermario/blob/main/src/general_he...
> Re: ReactOS, and Re: 10NES... [Wall of text]
No one is claiming that reverse engineering is illegal. What is claimed is that decompiling a protected work in full and then distributing that decompilation is definitely illegal.
You can definitely decompile for reverse engineering. I have done it as part of my regular work, at least in the EU. But it is ridiculous to think (and I emphasize: ridiculous) that just because I apply a simple transformation to a protected work I can end up with a non-protected work that is legal for me to distribute without authorization.
It would mean the end of copyright for computer programs as we know it.
In fact, it is so ridiculous, that even since the act of _compilation_ is also a non-revertible transformation (or in your terms, non-bijective), the actual object code would NOT be subject to copyright ! (Because, despite what you're saying, what is copyrighted is the actual source code).
Allow me to introduce you to ReactOS.
https://reactos.org/