Some of the techs are race specific and cannot be traded !!!

It could be based on alignment, but what I meant was that certain techs are race-specific: i.e. the Torian techs only work for the Torians, the Thalan techs only work for the Thalans, etc. These races may still offer these for trade, and will accept payment for them, but when you close the trade window, they will not show up in your list. You will need to learn which techs are race-specific, or you will occasionally get 'played'. Some of these will show up in the trade window with an asterisk (*) next to them, but I don't believe at this time that they all do. If anything along these lines has changed in the latest patch(es), please let me know.

Makes it harder on your econ since you cant sell techs, and makes it a little tougher to develop planets since you can't trade for other races techs, like factories or labs, etc.