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# Lesson 3: Subscribe to Kafka Topic Views
**diffusion-kafka-app-L3** introduces the concept of [Security](https://docs.pushtechnology.com/docs/6.5.1/manual/html/designguide/security/c_security.html) and topic [path permissions](https://docs.pushtechnology.com/docs/6.5.2/manual/html/designguide/security/permissions_reference.html) for fine-grained security management of your data structure. It also shows how to Subscribe to fx data using [Diffusion Topic Views](https://docs.pushtechnology.com/docs/6.5.2/manual/html/designguide/data/topictree/topic_views.html) in order to consume what you need, not all the Kafka stream.

# APIs used in this application
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There are no APIs used for these steps.

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done


![](https://github.com/pushtechnology/tutorials/blob/master/data-store/diffusion-kafka-app-L2/images/topic%20views.png)

## Step 4: Check the Topic View is multiplexing the Kafka firehose
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I think this is not very clear. The term “multiplexing” might be confusing to users.

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