It was reported to us that Minitool's partition wizard bootable cd (pwfree9.iso) is based on TC, and with no sources nor mention of the license on their site, would violate the GPL.
At the surface it indeed looks like it, as their initrd is named tinycore.gz, just like ours used to be around the time the iso was made. However, there are none of our files inside, so it is not a TC derivative.
The iso does include busybox, and so does violate the GPL, but it does not violate Tiny Core copyrights.