This is a software tool (Windows only) that will enable you to easily and quickly protect your WordPress content from being accessed, unless the visitor has joined your email list and received the password to proceed.
Instructions are here:
http://earn1kaday.s3.amazonaws.com/downloads/pw-protect-premium.wmv
RIGHTS:
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[no] Has Master Resell Rights
[no] Has Giveaway Rights
[no] Has Resell Rights
[yes] Can be Included in Paid Membership Sites
[no] Can be Included in Free Membership Sites
[no] Can Be Sold on Auction Sites
[yes] Can be Bundled with other products
[yes] Can be Offered As a Bonus to a Paid Product
[yes] Can be sold (suggested minimum price is $12)