I am a postdoc and for the past several years I have been teaching a course for which I have designed all of the lectures, seminars, reading lists, etc. A new colleague joined our faculty last year as an adjunct. This colleague is very competitive and ambitious and, unfortunately, appears to see me as a rival for any future tenure-track jobs in our faculty.
Our university uses an online virtual learning environment where we are required to post all teaching materials (slides, recordings of classes, etc.). The platform also tracks the activities of enrolled instructors and students. Faculty staff can auto-enroll in a given course for admin reasons.
I noticed that I had a new enrollment mid-semester, the new colleague. I checked the activity records. That colleague has watched all of the lectures and downloaded all of the slides, reading materials, etc. I was informed by a friend in the faculty that this new colleague now claims to have designed a course on exactly the topic I teach. This is what this new colleague has told the Dean, who will be heading up the hiring committee for a tenure-track job soon (for which teaching this course is a requirement).
Should I report this to somebody? For example, the Dean? Can I even be justified in doing that? I feel that I do not have enough evidence, since I do not know for sure whether this colleague is using my materials or the extent to which they are modified. I do not want to confront the new colleague about it as, based on my very limited interactions, they are quite unpleasant to deal with and would surely twist the narrative somehow.
For context: At my university and in my country, we retain intellectual property over our own teaching materials. Especially for early career academics (most of whom teach, like me, on an hourly paid 'adjunct' basis), our teaching materials are regarded as an important part of our portfolio.