Stopping students from deleting files from TC

I'm setting up a TC for a small film school. I'm hoping for several questions to be answered here, so forgive me if this is a large topic.
Issue 1: Students deleting files.
I'm hoping to put the days lesson plans on the TC. This way, students can come into class and download the days required media. My concern is a student might accidently delete the footage from the TC before everyone gets to download it. Is there a way to restrict certain users from deleting stuff on the TC? I've fooled around with folder/file Permissions, but have had no luck.
Issue 2: Password Protected Folders
I'm hoping for the students to be able to store completed projects on the TC so they can make a "Best Of" DVD at the end of the term. I would like each of them to have a password protected folder to limit who can copy data into the folder. The only thing I have found thus far is a way to set up a .dmg file. This would work fine, however other students could still delete the .dmg, resulting in a mad student, an expelled student, and a frustrated instructor. I guess this is the same as issue 1, just a different scenario.
Any advice?

Hi Jim,
I was just scrolling around trying to find some answers to issues I'm having with TC and your post caught my eye. I work with a new company out of Palo Alto Ca. called Aspen Learning. We have a new classroom server that offers learning management tools, web 2.0 collaborative tools, and also teacher and student file storage. Please visit our website www.aspenlearning.com, and feel free to contact me directly at [email protected] It may be a great solution for your needs.
Take care,
Tony

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