Hi,
Do you mean , at the moment it is not possible to use percona pg_tde with postgreSQL community open source edition ?
Yes, that is correct. Because pg_tde is such a radical and substantive piece of technology key updates are required to the base code. And at this time we are actively working with the community in this regard.
FYI: Otherwise Percona PostgreSQL is virtually the same as the community version.
Hope this helps.
regards
Robert