The primary purpose of the adaptor pattern is to change the interface of class/library A to the expectations of client B. The typical implementation is a wrapper class or set of classes. The purpose is not to facilitate future interface changes, but current interface incompatibilities.
The proxy pattern also uses wrapper classes, but for a different purpose. The purpose of the proxy pattern is to create a stand-in for a real resource. Reasons for using a proxy can be
* The real resource resides on a remote computer (the proxy facilitates the interaction with the remote resource)
* The real resource is expensive to create (the proxy ensures the cost is not incurred unless/until really needed)
The most important thing is that a proxy provides a drop-in replacement for the real resource it is a stand-in for, so it must provide the same interface.