A privilege discriminator selects a first user to be in a first group of participants to participate in a screen sharing session. The privilege discriminator selects at least one second user to be in a second group of participants to participate in a screen sharing session. The privilege discriminator selects a first screen region for sharing to at least the first group of participants and selects a second screen region for sharing only to the second group of participants. The privilege discriminator shares the first screen region with at least the first group of participants, wherein the sharing is selecting a device authenticated as being used by one of the first group of participants. The presentation privilege discriminator sharing the second screen region with only the second group, based on selecting the second screen region and selecting the second group, excludes the first group from receiving the second screen region.