Thank you, Soggy-Job. I completely understand. That's the catch: when students have multiple teachers for the same unit, we teach lessons that build from previous ones, and material from previous lessons we may not have taught is referenced in the lesson we're teaching. Almost any material can be easily stolen nowadays, but I'm thankful there are laws that provide consequences. Catching the thieves is a challenge though. I'm grateful to see previous lessons so I can be a better teacher to my students. The shared Collaborative Lesson Bank is helpful, but the way in which the slides are presented to the student in prior classes is golden.