[IAM (Identity and Access Management)](https://cloud.google.com/pubsub/access_control) allows you to set permissions on invidual resources and offers a wider range of roles: editor, owner, publisher, subscriber, and viewer. This gives you greater flexibility and allows you to set more fine-grained access control.
For example: * Grant access on a per-topic or per-subscription basis, rather than for the whole Cloud project. * Grant access with limited capabilities, such as to only publish messages to a topic, or to only to consume messages from a subscription, but not to delete the topic or subscription.
*The IAM access control features described in this document are Beta, including the API methods to get and set IAM policies, and to test IAM permissions. Cloud Pub/Sub's use of IAM features is not covered by any SLA or deprecation policy, and may be subject to backward-incompatible changes.*
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