I have downloaded Acrobat Extended Trial. Actually I purchased over the phone and the sales person instructed me to download while waiting for disks. Well I should have just purchased online instead and then I would have gotten my serial number directly, i think... Any way...
I have created in several attempts geo registered pdfs and also pdf files from reading an ACAD dwg file. NO SECURITY enabled on any. Even so, Adobe Reader 9.x will not use the measure or commenting features. I check the file properties in Reader and the security is set to not allow! But how could that be? It was set to Allow when created with Acrobat Extended. Is this because Acrobat Extended is a trial version?? The main reason I purchased this product is to create pdf files that my clients can buzz around in and have measuring and layering capabilities.
Open the PDF in Acrobat Pro Extended, and on your menu choose Advanced...Extend Features in Adobe Reader.
You'll be warned it's applying restrictions and asked to save a new copy. When you open this new copy in Reader, you'll be able to use all the commenting and measuring tools.