I wish to know if you know one software/page that permit to know the level of uniqueness of 2 articles. Every answer is much appreciated.
Well, on a basic level, you can try pasting the content on the google search bar, and if you find similar content then you can be sure of the fact that the content is not too unique. For knowing the actual 'level' of originality, you can use dupecop, as suggested by hoster Regards, Jeewant