PegaWORKS 8.1.x has never been tested with Oracle TDE nor we are aware of any customers using Oracle TDE. Please note that Pega has stopped certifying legacy PegaWORKS or any of its leagacy peripheral components with newer platform or software combinations. Also, Pega has stopped releasing any newer version of the PegaWORKS product long back. Having said that you can certainly test it in your environment and let us know if you find any issues. We will try to assist you if something is feasible per current design of PegaWORKS or its third party components.