shmerl: It doesn't matter however, since we are talking about what GOG can improve in the TOS to simply avoid all this issue. I.e. remove all that prohibition paragraph to begin with.
Gersen: You do realize that even if they remove it, it doesn't mean that you are "authorized" to do it, right ?
are you sure? That would be an interesting question. Though we probably should get a few lawyers in here ;)
There was this case in the US:
Lewis Galoob Toys, Inc. v. Nintendo of America, Inc, which "established the rights of users to modify copyrighted works for their own use":
"Having paid Nintendo a fair return, the consumer may experiment with the product and create new variations of play, for personal enjoyment, without creating a derivative work."
on the european side we have this case from the European Court of Justice:
SAS vs WPL:
"Second, the court concluded, with some circularity, that a person who has a licensed copy of a program is entitled,
without needing authorization from the copyright holder, to "observe, study or test the functioning of that program so as to determine the ideas and principles which underlie any element of the program", [...]
The court also indicated that a license provision that attempted to override this limitation, such as a blanket prohibition on reverse engineering, would be null and void."
And while this legal debate might be fascinating, it isn't really why GOG should change that paragraph. As others have already stated GOG knows how important reverse-engineering is, they also know how important modding is.
And in practice we already see that they allow and even advertise mods and fan patches.
Why then not take the next step and also legally allow it?
@Gersen
You are right in pointing out that the change mighty not be as extreme as I thought (I missed those installer EULAs), and your argument that the rage here is a bit over the top is also not completely wrong. But do you have actually some argument for as to why that prohibition of modification should be in the EULA?
That is was there before and that others have it as well isn't really an argument.