# Access control for notebooks
<a name="security-access-control"></a>

You must use different procedures to control access to Amazon SageMaker Studio Classic notebooks and SageMaker notebook instances because they have different runtime environments. Studio Classic uses file system permissions and containers to control access to Studio Classic notebooks and isolation of users. A SageMaker notebook instance gives users that login to the notebook instance default root access. The following topics describe how to change permissions for both kinds of notebooks.

**Topics**
+ [Access control and setting permissions for SageMaker Studio notebooks](security-access-control-studio-nb.md)
+ [Control root access to a SageMaker notebook instance](nbi-root-access.md)