At home or at the office there may be certain documents you want to secure from prying eyes. You may not want to create several levels of passwords to access the documents, just the few or the one. To secure a single document you must decide what level of security you desire.
You can restrict editing, access or make it read only. To do so, open the document you want to secure. Click on File and then click the Permissions button. There you will be able to choose what type of security is best for your document.