Legal warning

README.md

@@ -47,6 +47,8 @@ Know about risks on the internet and how they can be prevented is very useful. E
 
 This repository aim first to establish a reflection method on penetration testing and explain how to proceed to secure an application. And secondly, to regroup all kind of tools or resources pen testers need. **Be sure to know basics of programming languages and Internet security before learning pen testing.**
 
+Also, this is important to inform yourself about the law and what you are allowed to do or not. According to your country, the computer laws are not the same. First, check laws about privacy and surveillance : [Nine eyes countries](https://en.wikipedia.org/wiki/Five_Eyes#Other_international_cooperatives), [Five eyes](https://en.wikipedia.org/wiki/Five_Eyes) and Fourteen Eyes. Always check if what you're doing is legal. Even when it's not offensive, information gathering can also be illegal !
+
 ## Some vocabulary
 
 **Black/grey/white hat hacker** : Someone who uses bugs or exploits to break into systems or applications. The goal and the method differs depending if he's a black, grey or white hat hacker. A black hat is just someone malicious that does not wait permission to break into a system or application. A white hat is *usually* a security researcher who practice ethical hacking. A grey hat is just in the middle of these two kind of hackers, he might want to be malicious if it can be benefit (data breach, money, whistleblowing ...).