Comment Re:oh jeez (Score 2, Informative) 250
Florian,
It's not an anti-trust situation because the situation you describe is exactly the same as Apple's whole business model which has been upheld with legal precedent. You say IBM doesn't want to make z/OS available for use on non-IBM hardware - that is the same argument Pystar tried with Apple not wanting to make OS X available for use on non-Apple hardware. The courts expediently slapped Pystar down and confirmed that business model is perfectly OK.
The emulator is an entirely different issue. Anyone is free to clean room backwards engineer an emulator for the purposes of interoperability - that is allowed under the fair use doctrine. However, they cannot use any copyrighted or patented technology that IBM created in order to do so. IBM is under no obligation to assist them in creating or maintaining their emulator. IBM is perfectly in the right to demand legal review of the emulator if they feel that it violates any of their IP. As this can only be done in a court of law through legal discovery, it is not unreasonable to expect that the group behind the emulator would receive the typical legal paperwork (demands) that initiate the process.
Any company is free to compete in the mainframe market by offering their own hardware and software solution. If they can't convince customers to switch to their platform from IBM's that is just capitalism at work.