Part of the software is Freeware or Public Domain or have been added upon request of the programmer. And for some I have asked permission from the copyrightholder. But, there is also quite some software (Like the Konami, HAL & Compile stuff) which is of course copyrighted and from which I don't have permission to publish them this way.
I have more or less taken the risk: I expect that they don't actively search the web for this old software. But as soon as I will receive a NTD request from one of the copyright holders, I will remove their software of course.