If you get this error message when protecting files then follow the guidelines below:
- Make sure the actual path+name of the file does not exceed 255 chars
- Protect the documents from a Windows 7 computer
- Protect the files on a local drive rather than a network one to eliminate any network issues and path names
- Close down any unnecessary applications to free up available memory
If the error still occurs and you are protecting a lot of files in one go using command line then split your files into sub-folders for separate processing.