I tried by saving a word document via save as / tools / security options / protect document (forms+password). This seemed to work but I was able to beat it by opening a blank document, then inserting the protected document into the blank. Upon doing so I could change the text freely.
Please let me know if there is any way to protect the file or if any downloadable encription software would do the trick. I've heard that by converting the files into adobe format will allow some protection, but I dont have the full version of acrobat to test this and would like to aviod having to buy it.