Yet another reason why DRM is wrong. When a Barnes & Noble customer tried to download a previously paid-for book, an error message appeared, stating that the download had failed because the credit card on file had expired. As the cool kids say, “Epic fail.” The expiration status of a credit card for a previously purchased book should be entirely irrelevant for a later download, and to extend the scenario, there should be no requirement that the account be linked to a credit card at all after the purchase has been completed. follow link
Is it a Unicode Font?
To determine if your font is Unicode-compliant, with all its characters coded and mapped correctly, choose the Font in any program (or in Font Book, set the preview area to Custom (Preview > Custom), and type Option-Shift-2.
If you get a euro character (a sort of uppercase C with two horizontal lines through its midsection), it's 99.9 percent certain the font is Unicode-compliant. If you get a graphic character that's gray rounded-rectangle frame with a euro character inside it, the font is definitely not Unicode-compliant. (The fact that the image has a euro sign in it is only coincidental: it's the image used for any missing currency sign.)
This assumes that you're using U.S. input keyboard, which is a little ironic when the euro symbol is the test. With the British keyboard, for instance, Option-2 produces the euro symbol if it's part of the font.
Barnes & Noble DRM Fails with Expired Credit Card