How to remove write protection on disk

[kamalkadawala]

i downloaded one of video but now I am not able to remove it, 'remove write protecting' this error is coming , how to remove it?

 

[ksiemb]

i downloaded one of video but now I am not able to remove it, 'remove write protecting' this error is coming , how to remove it?

You could try either of these utilities; unlocker or fileassassin.