I got a message this morning from a teacher who discovered that some other people were inadvertently added as collaborators to a folder in Google Drive. Since she was the owner of the folder, she was upset that someone else had given people permission to the folder. Especially when we are trying to protect student data we want to make sure that unauthorized people are not accidentally given access to our documents.
Within the share window, at the bottom, is a link to change permissions for who can add collaborators.
Within a document, click on the blue share button to find this setting.
To share a folder click on the folder in the new Google Drive and click on the share icon above the document list.