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A business acquaintance (the CEO) developed an idea and brought me in as the CTO and his other friend as a designer. A prototype was developed (by me and the designer) and as a result of personality conflicts the CEO quit. No business entity was ever formed, no contracts were ever signed except for casual email agreements. Now the CEO wants the source code for the project. I have no problem giving it to him as long as he relinquishes claim to any idea I pivot to based on the original idea. The designer is also interested in continuing without the CEO.
How should I word an email that asks for his agreement to relinquish future rights/equity on any idea I develop from the original idea?