cd_licenses.xml but the TDSE object is specified in your error message, which sounds like it's from the Content Manager and you have also tagged Content Porter which, again, is on the Content Manager side. Did you also renew your
license.xml file on your Content Manager?
From the online documentation
cd_licenses.xml contains license keys for publishing content to the Content Delivery server using one or more transport protocols.
license.xml contains license keys for the various Content Manager server software components
Failing that, I do not recall seeing an "Error getting library signature" before. I would suggest you verify that the license files are exactly as they were sent and have not had any extra characters/line breaks/encoding changes etc. added to them when they were deployed and then contact customer support.