Professor blatantly taking course material from internet (other schools) I am TAing for a CS course. The professor I am TAing for, I took the same course with him one year ago. In that semester and this current semester I am TAing, he has been taking lecture slides and simply relabeling the headers with our school name and date. Furthermore, this may be somewhat of a lesser problem, but he is also using material that can be found online from other schools for the exams and homework.

Question is: Is this practice allowed and should I say/do anything about this?

Update: Professor blatantly just told me that it's perfectly fine to do this. I did not want to make a confrontation so I didn't oppose what he said.
What you describe is over the top. However, it is quite common for professors to take material from other courses or textbooks. Preparing a course from scratch is a lot of work and that work is unnecessary if there are already courses online with similar material. Usually, the professor will combine several sources and/or add in some of their own material, rather than straight copying.

The professor should acknowledge the source of the material. I often see course websites list textbooks or similar courses at other universities. Invariably, much of the course material will be sourced from those textbooks and those other courses.

However, you say that your professor is also copying exams from this other course. This is dangerous if a student figures out the source. I think this is actually the bigger problem. This may also explain why the professor may be reluctant to name the source of the material.

TL;DR: The practice is allowed to a certain extent, but it sounds like this case is possibly excessive. In your situation, I would tell the professor that you found similar exams online and are worried that the students will find them too, but I would avoid making any accusation of plagiarism.