We do similar file/cad data protection here. Everything is on a network drive, and only one person has write access to place SW files into this folder(s). Sounds like that one person would be you at your place . No pdm/epmd for us, just windows folders permissions. So, here's a short rundown of our process.
1. File storage - all items that require engineering drawings are stored in a write protected folder, again, only one person can place files into this folder, all others have read only access. Items that do not require engineering drawings, nuts, bolts, etc., are placed into a folder that everyone has read/write access to.
2. So, to modify a file/part that has read only access, the user is forced to save it to their own computer, due to their read only access. This doesn't force them to rename it, but it would be up to the person who uploads to the read only directory to make sure it's appropiate to upload the file.
We have a sererate mrp system that handles part numbers, drawing rev levels, work orders, etc. Topic for another day.
Keep it simple.