Liferay document checkout/in permission

I am using Liferay 6.2 EE sp7 Tomcat bundle on Linux.

We have a use case for the normal regular users to upload, check in and out documents from the document and media portlet.

I see the Checkout and Check in options when I am logged in as a administrator but not as a regular user who is a site member with default permissions.

Question: Is there a way to turn on the Check out/in options for the regular users either with configuration via properties file or permssions etc.?

Steps I took:

As an administrator:

• Create a site with private pages only.

• create a private page and add document and media portlet and a document and media display portlet to the page.

• create a folder in the site.
• upload couple of documents to the new folder.
• You will be able to see the checkout option after clicking on the document you just uploaded in either of the portlets (see screen shot)
• Add a regular user(non admin) and make a site member of the private site.

In a different browser:

• login as the regular user and navigate the private page/site created above.
• click into the folder/file uploaded above.
• the Check out option is not present.

I have researched portal properties, portlet permissions and the configuration option of the portlets above. I don't see anything that is hopeful or that works.

Please let me know if there is a work around or configuration I need to do turn this on.

Thanks a lot for the insight!

I've checked it on liferay-portal-6.2-ce-ga5, but I think it can be similar in your version. You can set this permissions for "regular user" role (I set it for Power User role):

Documents and Media Display > Document: Override Checkout 
Documents and Media Display > Document: Update

"Override Checkout" permission requires "Update" permission.

After this checkout/checkin options are available for my non-admin user.