The Apache license applies to the Java SDK (== the Java library Amazon made to help developers use their (HTTP)API). It does not apply to the Amazon (HTTP) API specification (or implementation) itself. Oracle could, for example, implement their own "Oracle storage bucket Java SDK" with a matching (Java) API that developers could drop in instead of Amazon's in their Java projects and wouldn't have to change any code, but that is in no way transferable to the (HTTP) API (i.e. the one that runs on Amazon's servers).