My question is about read,write and execute permissions of a file in Linux:

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http://askubuntu.com – 1)I've created a text file and I've assigned read only permission to that file . 2)Now when I copy that file to NTFS partition then its read only permission is vanished and I'am able to modify that file . 3)So,what happens to the permissions of file that I changed in Ext4 partition of Linux?It is not secure at all. (Please , please bare with my English.) (HowTos)