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ZPL (older) (1) all copies of the Original Code in Executable and Source Code form must, as a form of attribution of the original author, include on each user interface screen (i) the original Zimbra logo, and once for each user session (ii) the copyright notice as it appears in the Original Code; and (2) all derivative works and copies of derivative works of the Covered Code in Executable and Source Code form must include on each user interface screen (i) the "Zimbra Powered" logo,, and once for each user session (ii) the copyright notice from the version of the Covered Code from which the copy or the derivative work was made. In addition, the original Zimbra logo or the "Zimbra Powered" logo, as appropriate, must be visible to all users, must appear in each user interface screen, and must be in the same position as and at least as large as the Zimbra logo is within the Original Code. When users click on the original Zimbra logo it must direct them to zimbra.com, and when users click on the "Zimbra Powered" logo it must direct them to zimbra.com/powered. This obligation shall also apply to any copies or derivative works which are distributed under the alternative terms of Section 3.6 and this obligation must be included in any such license.