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Yes, the rule is source must follow binary.

You can even sell the binary for money, distribute the source with it and simply ask your client to not-redistribute the source to someone else and it's fully legal.

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not under the gpl, you can't

Well, ask and compel are different. I'm pretty sure you can ask them to do anything, up to and including barking like a seal. You can't compel them to do it under GPL though.

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