xStore is only obligated to provide source code to those people who received binaries.
The reason we require the offer to be valid for any third party is so that people who receive the binaries indirectly in that way can order the source from you.
Those who have received binaries, although not necessarily from xStore, must be able to receive the source code. Take, for example, the PS2-Linux kit. No source code is made available to anyone except those who purchased one. However, some (very few) owners of the kit are distributing that source just like the GPL says they can, and that's how PS2 support is being added to the MIPS kernel tree.
xStore is only obligated to provide source code to those people who received binaries. If they don't want to give the source to anyone else, then they don't have to. The serial number is probably to verify that you have the hardware. However, once you have the source code, you can do what you want within the confines of the GPL, including post it on SourceForge, your website, or the door of your local church with a tack.
The IBM Public License is interesting in its source code distribution policy. It states that source code must be distributed in a format typically used for storing program code. In other words, unlike some Open Source licenses, the IBM license prevents you from distributing the source carved into a grain of rice, or coded into the DNA of an engineered bacterium.
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Those who have received binaries, although not necessarily from xStore, must be able to receive the source code. Take, for example, the PS2-Linux kit. No source code is made available to anyone except those who purchased one. However, some (very few) owners of the kit are distributing that source just like the GPL says they can, and that's how PS2 support is being added to the MIPS kernel tree.
xStore is only obligated to provide source code to those people who received binaries. If they don't want to give the source to anyone else, then they don't have to. The serial number is probably to verify that you have the hardware. However, once you have the source code, you can do what you want within the confines of the GPL, including post it on SourceForge, your website, or the door of your local church with a tack.
The IBM Public License is interesting in its source code distribution policy. It states that source code must be distributed in a format typically used for storing program code. In other words, unlike some Open Source licenses, the IBM license prevents you from distributing the source carved into a grain of rice, or coded into the DNA of an engineered bacterium.