On full payment for a phase, all intellectual property rights in the deliverables of that phase transfer to you, to the fullest extent transferable under applicable law, together with the repository, infrastructure configuration and documentation needed to operate them.
We retain rights in our own pre-existing tools, libraries and general know-how. Where any of that is embedded in a deliverable, you receive a perpetual, worldwide, royalty-free licence to use it as part of that deliverable.
We do not retain a lien over your product, your code or your infrastructure.