Adobe Reader app is not allowing me to edit!

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http://androidforums.com – Hello all! I have a Samsung Galaxy Tab 7.1 inch running on Ice Cream Sandwich version 4. As the Adobe PDF Reader app allows for editing PDFs (highlighting and such), I decided to take the opportunity to use my Galaxy Tab for reading textbooks. However my biggest problem is getting the Adobe Reader app to actually let me edit. I changed the properties of the PDF to allow universal reading and writing, I then upload to Google Drive, and then view the PDF with Adobe Reader, but it keeps on displaying the message that this PDF is a read-only file. I don't know why it's saying this despite me cha (General)