The Blizzard End User License Agreement explains what you may and may not do with a Blizzard account. This article highlights a few passages from the EULA that are most relevant to this policy.

How to manage your Battle.net profile visibility and chat settings

Information on the Blizzard Voice Chat feature

Information about two-factor authentication requested for digital purchases.

Instructions for troubleshooting your network to allow Blizzard services to work properly.

Altering sound options through the operating system.

Information about why you may not be able to post in the forums, and steps for how to fix it.

Information about unapproved peripherals.

The Battle.net Deskop App can't be launched due to an operating system error.

Steps on how to create a new Administrator Profile.