[hyltom]

I'm looking at protecting files I'm sending to some clients. PDF files have some editable, printing.... protection which is good but i also would like to have my files readable only few days. Does someone know how to do that?

[yolk]

i heard about this more than a year ago as solidworks was supposed to use this software..haven't looked at it though:
http://www.liquidmachines.com/

[polynurb]

if i have to send sensitive information i use 7 zip with aes-256 encryption.

anyway "self destructing" dl links or messages might be usefull..doing a quick search i found this.. maybe it helps you

http://thinkabdul.com/2007/07/25/ten-fr ... -interval/

[JTB]

There were 1-2 apps mostly for presentation that had this feature... You could show the product to your client but he had to pay you for the unlock code otherwise the (.exe) file was useless after the deadline