Google provided a possible out for publishers critical of iTunes subscription rules today by introducing One Pass at a Berlin event today. The subscription system gives readers a single sign-on to get access to digital magazines and newspapers while also deliberately loosening the restrictions on publishers. Unlike on Apple's store, publishers will still have the option of giving away free digital access with print subscriptions or using more varied options like metered access and "freemium" where the content is a mix of both free and paid.