Keep in mind open source software is frequently licensed through EULA's as well. The "legal" way that this particular person received BitKeeper, was through a EULA which included some restrictions on the use of the product. If the EULA is illegal, then this particular person had no legal means to obtain BitKeeper, which means they violated BitMover's copyrights in order to get the software. This is the same principle which protects the GPL.
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