I was trying to apply SUPEE-5344 patch to Magento but getting following error. I don't understand. Is the patch already there ? If yes then why does Magento gives messages to apply the patches

Checking if patch can be applied/reverted successfully...
ERROR: Patch can't be applied/reverted successfully.

patching file app/code/core/Mage/Admin/Model/Observer.php
Reversed (or previously applied) patch detected!  Assume -R? [n]
Apply anyway? [n]
Skipping patch.
3 out of 3 hunks ignored -- saving rejects to file app/code/core/Mage/Admin/Model/Observer.php.rej
patching file app/code/core/Mage/Core/Controller/Request/Http.php
Reversed (or previously applied) patch detected!  Assume -R? [n]
Apply anyway? [n]
Skipping patch.
2 out of 2 hunks ignored -- saving rejects to file app/code/core/Mage/Core/Controller/Request/Http.php.rej
patching file app/code/core/Mage/Oauth/controllers/Adminhtml/Oauth/AuthorizeController.php
Reversed (or previously applied) patch detected!  Assume -R? [n]
Apply anyway? [n]
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file app/code/core/Mage/Oauth/controllers/Adminhtml/Oauth/AuthorizeController.php.rej
patching file app/code/core/Mage/XmlConnect/Model/Observer.php
Reversed (or previously applied) patch detected!  Assume -R? [n]
Apply anyway? [n]
Skipping patch.
2 out of 2 hunks ignored -- saving rejects to file app/code/core/Mage/XmlConnect/Model/Observer.php.rej
patching file lib/Varien/Db/Adapter/Pdo/Mysql.php
Reversed (or previously applied) patch detected!  Assume -R? [n]
Apply anyway? [n]
Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file lib/Varien/Db/Adapter/Pdo/Mysql.php.rej