Making sure that diffusion model-generated images are safe from undesirable content and copyrighted material is a serious concern. Previous methods for stopping this content could be easily bypassed, but this new technique can fine-tune the model weights to erase concepts permanently, without having to retrain the entire model. The technique works by using the model's knowledge to guide the output away from the targeted concept. The authors have tested this technique on artistic style erasure and erasing nudity from images, and found it to be more effective than previous methods at erasing targeted concepts. However, for large concepts, there may be a trade-off between complete erasure and interference with other concepts.