# ownCloud Server Administration Manual

# File Sharing

ownCloud users can share files with their ownCloud groups and other users on the same ownCloud server, and create public shares for people who are not ownCloud users. You have control of a number of user permissions on file shares:

- Allowing users to share files
- Allowing users to create public shares
- Requiring a password on public shares
- Allowing public uploads to public shares
- Requiring an expiration date on public share links
- Allowing resharing
- Restricting sharing to group members only
- Allowing email notifications of new public shares
- Excluding groups from creating shares

Configure your sharing policy on your Admin page in the Sharing section.

- Check `Allow apps to use the Share API` to enable users to share files. If this is not checked, no users can create file shares
- Check `Allow users to share via link` to enable creating public shares for people who are not ownCloud users. This creates a hyperlink, just like a Web page, so your ownCloud server needs to be accessible to whoever you are sharing with
- Check `Enforce password protection` to force users to set a password on all public share links. This does not affect local user and group shares
- Check `Allow public uploads` to allow outside users to upload files to public shares
- Checking `Set default expiration date` sets a default expiration date on public shares, and checking `Enforce expiration date` makes it a requirement
- Check `Allow resharing` to enable users to re-share files shared with them
- Check `Restrict users to only share with users in their groups` to confine sharing within group memberships
- Check `Allow users to send mail notification for shared files` so that users can check “notify by email” when they create new file shares. This sends an email notification to everyone the file is shared with (everyone who has entered an email address on their Personal page)
- Check `Exclude groups from sharing` to prevent members of specific groups from creating any file shares in those groups. When you check this, you’ll get a dropdown list of all your groups to choose from. Members of excluded groups can still receive shares, but not create any

This is how it looks when a user creates a public share with passwords and expiration dates required:

This what a local share looks like. The user creating the share controls re-sharing, editing, updating, and deletion privileges:

Note

In older versions of ownCloud, you could set an expiration date on both local and public shares. Now you can set an expiration date only on public shares, and local shares do not expire when public shares expire. The only way to “expire” a local share is to click the trash can icon to un-share your files.

## Creating Persistent File Shares

When a user is deleted, their files are also deleted. As you can imagine, this is a problem if they created file shares that need to be preserved, because these disappear as well. In ownCloud files are tied to their owners, so whatever happens to the file owner also happens to the files.

One solution is to create persistent shares for your users. You can retain ownership of them, or you could create a special user for the purpose of establishing permanent file shares. Simply create a shared folder in the usual way, and share it with the users or groups who need to use it. Set the appropriate permissions on it– at a minumum `create`– and then no matter which users come and go, the file shares will remain. Because all files added to the share, or edited in it, automatically become owned by the creator of the share regardless of who adds or edits them.