How to set password protection to word 2010

Steps to protect our document/file:
First click on file and then info tab choose 'protect document'

Mark as final :

It means the document will be final and can’t be edited in future.choose this option only after  finalizing the document.it can be use to close the editing of the document in future.However we can unmark the document if we want to edit in future.

Encrypt with password /assigning of password to the document/file:

 

 It means than we can encrypt the document  with password .it is the main and important feature of office 2010 we can secure the the document by assigning password so that no one can open the document with out knowing password.Note that the password is case sensitive.if you forgot the password you will lose the document.so be care fully while assigning the encryption

Restrict Editing:

We can restrict the editing of the document by using this feature.by using this feature.we can edit restrictions the document by allowing the options such as read only,filling forms allowed etc.and we can specify the sharing of document.

ADD a digital Signature:

We can add the digital to signature to our document.As it is verified by third party certificates to ensure that copyright issues.to use this feature we have to connect a smart card with card reader.we can third party online certificates.

Thus we can protect our important files.