Copyright Protecting a File: With any bluetooth or Infrared capable phone, first delete the extension of the file with any file manager application. For example, if the file name is Green.jpg then rename it as only Green . Now exit the file manager, go to that file and rename it as .jar (i.e. If the file name is Green then rename as Green.jar ). Now send back that file to your phone via bluetooth or Irda. Thefile will enter directly into the applications folder. Move it to any folder u want. Thats it. Your file has become copyright protected now. That means no one can copy ur file via Bluetooth or Infra-red. Caution (if u dont have PC): After renaming the file as .jar uwill not be able to rename it back, coz s40 phones dont have java access permission via java applications. And after making a file copyright protected, u will never be able to send it to anyone. And u cant access them with any file manager also, as the extensionis jar. Remember, dont apply this trick in mp3 songs. Coz doing so, the music player will not detect the file. This trick is also useless for themes, coz themes need nth extension to work.