All the examples of the use of "De peur que..." are followed the use of the "ne explitif+ the subjunctive"
"Il ne voulait pas te le dire de peur que tu n'aies raison" He didn't want to tell you out of fear that you'd be right"
I assume that when "De peur que..." is followed by a possible negative result, the subjunctive is still used:
"Il ne voulait pas te le dire de peur que tu ne sois pas surpris." He didn't want to tell you out of fear that you wouldn't be surprised.
(Apologies if there is a lesson on the use of "De peur que + the subjunctive", I don't see a link here and I didn't find one listed under lessons.)
As always,
Merci beaucoup,
Hilary
