Startup, Negotiate these contract clauses with software developers/providers

I've seen tons of startups fighting with software developers. I've seen everything: blackmail, server turned down, source code robbery... and founders totally stuck because of that... You might wonder, are there any laws that can protect both? They are, of course, but THE most important are the terms that you can put in the development contract.So if you are a startup and if you want to delegate software development to a freelance or a software development agency, then listen this episode until the end to avoid the worst situations.