The solidcoin people (person?) can easily comply with the basically free license. What they did is wrong as they took the code and put new terms on it (which they can not do) as well as stripped out the proper credits. Making it right is near trivial and should be done to respect everyone who put in code into the bitcoin project.
Ironically they CAN change the terms. MIT license has no "copyleft" (google it) provision. You can take Bitcoin and make a closed source, pay only version if you want. MIT license allows you to do that. MIT license allows you to do almost anything EXCEPT:
a) remove copyright from other's work
b) remove the MIT license notification.
That's it. That is literally all you need to do to be compliant and somehow King RealScam figured out a way to mess that up (willfully IMHO).
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Ok, but adding terms is a whole lot less effective if he has to keep the MIT license and copyright in there. But you are correct, so all he has to do is put that text back in there.