Original sentence: Google asserts that Dalvik is a clean-room implementation rather than a development on top of a standard Java runtime, which would mean it does not inherit copyright-based license restrictions from either the standard-edition or open-source-edition Java runtimes.Oracle and some reviewers dispute this
Edited sentence: Dalvik is claimed by Google to be a clean-room implementation rather than a development on top of a standard Java runtime, which would mean it might not inherit copyright-based license restrictions from either the standard-edition or open-source-edition Java runtimes.However, the claim that Google's implementation of the Java runtime is clean-room is disputed by Oracle and some reviewers