A few thoughts on this: 1. I have done transactional work and litigation in and about these areas for nearly 30 years in Silicon Valley. Based on that experience, in practical terms, the risk you deal with in doing side work boils down to this: it is rare that an employer will make a claim to IP you develop on your own time and using your own resources but, when it does happen, its effect is pretty horrific. 2. Calif…
"If what you are planning to do has commercial value, then make sure to get it checked by a good local lawyer who can guide you through the pitfalls and explain alternatives." Is being no-longer-employed by your employer an absolute defense, assuming that you can prove that any IP in question was created after the end of your employment? I'm thinking of the case where an employee does something that's either not of c…
Short answer: there is no absolute defense in the fact of your no longer being employed when you do the allegedly offending activity.
BTW, I don't know enough about the Andreessen or Google examples to comment intelligently on the specifics there.