# Security & Access Control

For security purposes, Organization spaces and boards are protected by default to non-members.

You can use the following methods to control access to the Organization Account:

* Restrict who can become a team member by using domain-based access control
* Enable invite approvals. <mark style="background-color:purple;">Enterprise plan only</mark>
* Setup Single Sign-on (SSO). <mark style="background-color:purple;">Business and Enterprise plans only.</mark>
* Invite Guests (external collaborators) to boards. Guest access is restricted to just the board shared with them. <mark style="background-color:purple;">Business and Enterprise plans only.</mark>

### Organization Access

All plans are able to restrict access to the organization and set whitelist joining rules with the [Auto Join](/management/manage-account.md#auto-join-settings) setting, or for Business and Enterprise plans through integration with your [Single Sign On](/management/single-sign-on.md) provider.


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