Adobe Reader for iOS can handle unencrypted and encrypted PDF documents, supports Adobe Live Cycle rights management, and includes content searches in documents, PDF bookmarks, thumbnail page views, copy and paste from PDF files, AirPrint, and emailing documents from within the app.
The app requires an iPhone 3GS or newer, third or fourth generation iPod touch, or an iPad or iPad 2. Adobe Reader is free and is available at Apple’s iTunes-based App Store.