When using the streaming API, do I need to have an account on AWS?

No, you can run the streaming API in your own data center -> You would go to the following Github links which provide instructions on how to download either the Java SDK or Python SDK. 

Java: https://github.com/Nasdaq/NasdaqCloudDataService-SDK-Java
Python: https://github.com/Nasdaq/NasdaqCloudDataService-SDK-Python

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