To display this wizard, select Document > Document Properties, click the Security tab and choose Certificate Security from the Security Method drop-down list.
Specify settings in the wizard panels
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Select the checkmark if you want to save your settings as a scheme. In this case, specify a scheme name and description and browse for a custom appearance if you wish. Click Next.
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Specify the type of document contents you want to encrypt and select an encryption algorithm. Click Next.
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Select a Recipient allowed to open your documents secured with the specified scheme and click the 
Set Permission button to specify a combination of permitted actions for each of them. You can add further recipients from the Trusted Contacts list. For this list, click the 
Import button to add existing certificate schemes from other locations, or click the 
Create button to create new ones. Click Next.
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An information window summarizes most important attributes of the specified scheme. To accept them, click Finish.
