I am a young postgraduate researcher, and I have developed an algorithm to measure the blood flow from echographic signals in a novel manner. I currently only have one published paper from my pregraduate years, on which I am 4th author, and it is not about my current field of research.
Long story short, my algorithm is unpublished and works quite well... so well that recently a PhD in electrical engineering from the other side of the planet saw a summary about it on the net, and sent me an email asking for some data, so that one of his undergraduate students can reproduce my program. They assure me that they won't use it for publishing, and both the PhD and his supposed undergraduate sent me several emails already. When I asked for precisions about their project, they just in essence replied: "We don't really know yet, but we would like to reproduce your work"
I don't know what to answer... moreover, the data they are asking for (a video of an echographic exam) can be found in 10 seconds on Youtube. What should I do?