The text of the screenlocker is:
Your computer has been locked and all your files are encrypted with 2048-bit RSA encryption. In order to unlock your computer and files you need to fill out a survey.
You must use only REAL information while filling a survey (name, surname, address, phone number...). SMS mobile phone surveys unlock faster.
After completing a survey, you will download a txt file containing the needed code to unlock your computer and files.
Once the right key is entered, this message will disappear forever, your computer and files will be unlocked.
Do not worry, this one can be removed and it does not appear to encrypt your files.