The Mac App Store debuted Thursday with the release of Mac OS X 10.6.6. Some users already have found a way around the DRM system designed to ensure that they have paid for the apps that they re using. The technique seems to work only on apps that don t correctly implement the method for checking the App Store receipts. Several sites are reporting that users can bypass the technology that Apple advised developers to use to protect their apps by copying and pasting the receipt from a legitimately downloaded app into a premium app that s been pirated.
Source: https://threatpost.com/mac-app-store-safeguards-bypassed-opening-pirated-apps-010711/74829/