This is a page from the Flash Renamer user manual.

Set Attributes

The Set Attributes function allows you to change the attributes of files and folders. To keep the current attributes, set the checkboxes to gray (shows in XP as a 'full' box) for the attribute you don't want to change.

Write Protected - Indicates that the file may not be changed. (Note however that this is not 100% secure, as individual software may ignore this and simply remove the write protection before modifying to the file.)
Hidden - Indicates that the file is to be treated as hidden. Programs like Windows Explorer do not show these files unless you change the default settings.
System - Indicates that the file is part of the operating system and should not be modified by users.
Archive - Indicates that the file has been changed since the last backup was performed and thus is scheduled to be included in the next one. Backup software will reset this attribute after a successful backup. If a file is modified this attribute is automatically set.

Problem:

You just copied files from a CD to your harddrive. Since the CD is read only, all files have the write protected attribute set, making it impossible to work with the files. Solution:

Using the "Set Attributes" function, simply uncheck the write protected checkbox. Leave all other checkboxes gray so you don't change them.