Therefore does this mean that if my university use a different plagiurism checker (such as turnitin) then my essay would be regonised as 100% plagiurised because the viper company has a copy of it?
No, it doesnīt. If you ran your paper through Viper, it canīt be detected by turnitin, unless it was previously submitted to turnitin. Turnitin will check the paper against all the previous papers in itīs own database, however it canīt access the database of any other plagiarism detector.
If you trully want to make sure that your paper is safe, despite the fact that you checked it by Viper, go and use writecheck.turnitin.com (Turnitin for students) and run it through. Youīll have to buy 5$ credit for 5,000 words, but at least youīll know what is your standing.