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GeetuGeetu 

Preventing password protected

We need to prevent password protected document(agreement) to be uploaded in sales force. Can some body give pointers how can i achieve this.
Raj VakatiRaj Vakati
1 .Encrypt on Files and Attachments


From Setup, in the Quick Find box, enter Platform Encryption, and then select Encryption Policy.
Select Encrypt Files and Attachments.
Click Save.


2 .password protect attached files​​​​​​​

Click Your Name | Setup | Customize | Content Deliveries | Settings and select or deselect the Enable content deliveries checkbox. If you don’t have access to the Content Delivery feature, contact Salesforce Customer Support to activate it.
To let users create and share links to Chatter files, click Enable Chatter file links. For more information, see Sharing Files via Link.
To let recipients of content deliveries preview Office 2007 files:
Click Your Name | Setup | Customize | Salesforce CRM Content | Settings.
Click Enable Office 2007 previews in content.
Click Your Name | Setup | Customize | Content Deliveries | Settings.
Click Enable recipients to preview Office 2007 content deliveries.
Some Microsoft Office 2007 features don't display correctly in previews.
Choose a default option for content-delivery passwords. Because content-delivery URLs can be sent to leads, customers, or any unauthenticated user, salesforce.com, inc. recommends requiring password protection if your users will send confidential documents via content delivery. The options below allow you to select an organization-wide default for content-delivery password protection.
Password protection is optional and defaults to OFF—If this option is selected, users can choose to require a password when they create a content delivery, but the Require Password to Access Content field on the create-delivery wizard is not checked by default.
Password protection is optional and defaults to ON—If this option is selected, the Require Password to Access Content field on the create delivery wizard is checked by default. Users can uncheck the option if they do not want to require a password.
Password protection is required—If this option is selected, a password is generated each time a content delivery is created. Users cannot opt out of the password requirement​​​​​​​

https://success.salesforce.com/answers?id=90630000000gvRhAAI​​​​​​​