Simple plugin that helps to mask your URLs and do not expose your site is running on Osclass classifieds script.
Obfuscate Osclass Folders and Links
Besides that, plugin contains detail guide how to change oc-content and oc-includes folder names, add rules to .htaccess files to redirect old directory to new one, update config.php to define new folder names, rename folders etc.
Note: Plugin require good PHP knowledge to be able to fully utilize it!
Note: Plugin only runs OK on Osclass 8.1.0 or higher!