Being given exclusive rights to transfer with a particular channel or Companion.
When channel and Companion, or Donor find themselves in a transfer dependency and are unable to have transfer with another, they are said to be in an exclusive transfer relationship.
From: Unto Zeor, Forever, Ch 12. Snippet from Digen to Im'ran. ' “...Then we can apply for a lortuen exclusive and be taken off the rotation rolls completely. If I have to...” '
(Source: Index card file. Sime Surgeon http://www.simegen.com/sgfandom/rimonslibrary/surgeon/SURGEON1.html) Apparently an officially recognized form of transfer dependency, whether for therapy (with Donor Therapists or channel Therapists) or for reasons of Lortuen.
One person takes transfer only from another --- can be a donor who donates only to one channel: Rizdel to work only with Digen.