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I have to conduct some interviews for my PhD with people from industry. I need them to review my proposed method in order to validate it. However, I might need to send my work to those who I cannot conduct the interviews with them face to face. So how can I ensure the copyrights of my work? I am going to publish the method and the results right after I finish the interviews but how can I ensure that my work is not going to be used or sent to others before I publish it.