To learn about the template library, see Template Library.
Templates Created Using the WYSIWYG Content Editor
In the WYSIWYG template editor, click the Permissions tab. You’ll see a list of all the users in your account. By default these users only have viewing permissions, hence they cannot make changes to the template. However, if you want to allow only a specific group of people to edit your template, or even restrict to yourself, then under the Actions section, click on Modify Permission next to their names.

📋 Note: You cannot modify the permission of a user who is an owner.
Give the user editing access and click on Done.

Once you’ve granted edit access to specific users, only then will they be able to edit your template.
📋 Note: Template Editor permissions only apply to those who can edit the template. When email content is created using a template in the WYSIWYG Content Editor or the HTML Source Code Content Editor, users can make changes to the email content regardless of whether or not they have the rights to edit the template.
Templates Created Using the Drag and Drop Content Editor
Templates created using the Drag and Drop content editor have an additional level of access rights that control what the user of the template can do when creating email content using the template in the Drag and Drop Content Editor. This extra level of access control is perfect for increasing the efficiency of email content production.
For example, a template can be set such that users of that template can only make changes to the editorial content and the images — but they will not be allowed the make changes to the layout or the styles used in the email.
By default, users of the template can only view the Drag and Drop Content Editor. However, once you’ve set permission, then users of the template can make the changes in the email content that you allow. You can access the permissions section, by clicking on the Permissions tab in the Drag and Drop template editor.

📋 Note: Access rights in the Drag and Drop Content Editor are defined by the template at the time that the content is created. If the template’s user permissions are later changed, then they will NOT be reflected in any of the previous email content that was created using that template. The permissions will only be reflected in new email content created after the change.