Intriguing. Upon rereading, that is also a plausible interpretation. But I think the issue still stands, but in reverse: if the software is produced by SWF, is licensed to ACQ for use (but not modification), then there will be a need for ACQ (not SG) to negotiate a source-code license with SWF.
If OP's question is now about what sort of license terms would be workable, that's entirely up to SWF. They would be within their rights to not even answer the phone, once they've completed their delivery per whatever contract they have worth ACQ.