Je... I didn't know that even in "open source" (I don't like the term either)
OS's had backdoors been discovered(!)... (And I will, definitely, inform
myself about that OpenBSD episode...)
Concerning what I said, I can give you two references:
1)
https://www.european-privacy-seal.eu/press-room/press-releases/20080714-europrise-press-release-en.html
2) http://www.katherinealbrecht.com/
(Which you can confirm, by reading the "about" and "contact" pages in
Startpage.com.)
Concerning the "Tor" network (as I've previously said, in here -
https://trisquel.info/en/forum/how-use-tor-trisquel#comment-26792) I don't
trust it either (or find it a project credible enough to take any
recommendations from). Since, (as I say in the previous link) it's a project
that was developed by Big Brother itself...