Operation Manual

2) If you have not saved the document since the last change, a message box appears. Click
Yes to save the file.
3) The Digital Signatures dialog opens. Click Sign Document to add a public key to the
document.
4) In the Select Certificate dialog, select your certificate and click OK to return to the Digital
Signatures dialog.
5) The certificate used is displayed in the dialog with an icon next to its name.
This icon indicates the status of the digital signature.
– An icon with a red seal ( ) indicates that the document was signed and the certificate
was validated.
– An icon with a yellow caution triangle overlaying the red seal ( ) indicates that the
document is signed but that the certificate could not be validated.
– An icon of a yellow caution triangle ( ) indicates an invalid digital signature.
6) Click Close to apply the digital signature.
A signed document shows an icon in the status bar. You can double-click the icon to view the
certificate. More than one signature can be added to a document.
Removing personal data
You may wish to ensure that personal data, versions, notes, hidden information, or recorded
changes are removed from files before you send them to other people or create PDFs from them.
In Tools > Options > LibreOffice > Security > Options, you can set LibreOffice to remind (warn)
you when files contain certain information and remove personal information automatically on
saving.
To remove personal and some other data from a file, go to File > Properties. On the General tab,
uncheck Apply user data and then click the Reset Properties button. This removes any names in
the created and modified fields, deletes the modification and printing dates, and resets the editing
time to zero, the creation date to the current date and time, and the version number to 1.
To remove version information, either (a) go to File > Versions, select the versions from the list
and click Delete; or (b) use File > Save As and save the file with a different name.
310 | Getting Started with LibreOffice 5.0