Featuring heavy anti-debug and anti-reverse techniques this piece of software could not be analyzed by our reverse engineers. Can you crack it open?

As there can be a lot of valid keys, finding one will give you the flag. Just input it in the activation server at: nc challs.xmas.htsp.ro 15000

Note: some anti-virus (microsoft) may flag the executable. This is because all of the advanced obfuscation techniques that have been used, which are suspicious for the engine. Don't worry, the executable poses no harm.