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   Yahoo! DomainKeys Patent License Agreement v1.2

   Copyright (c) 2006, Yahoo! Inc.

   All rights reserved.

   This Yahoo! DomainKeys Patent License Agreement (this "Agreement") is

   between Yahoo! Inc. ("Yahoo!") and you ("Licensee"). By attempting to

   exercise any rights granted under this Agreement, Licensee agrees to be

   bound by all the terms and conditions set forth below, and subject to those

   terms and conditions, Licensee may use the intellectual property described

   below.

   1. LICENSE GRANT.

   1.1. Subject to the terms and conditions of this Agreement, Licensor hereby

   grants You a royalty-free, perpetual, worldwide, sublicensable,

   non-exclusive license under its rights to the Yahoo! Patent Claims to make,

   use, sell, offer for sale, and/or import Implementations.

   2. DEFINITIONS.

   2.1. "DomainKeys Developer(s)" means Yahoo, Inc. ("Yahoo!"), Licensor,

   and/or any other individual or entity who distributes Implementations under

   this Agreement.

   2.2. "Implementations" means the specific portions of a hardware or

   software implementation expressly required to be compliant with the

   Specifications for the sole purpose of a sender verification solution in

   connection with e-mail.

   2.3. "Licensor" means Yahoo! or any other individual or entity that elects

   to use this Agreement to license Yahoo! Patent Claims to any licensee.

   2.4. "Specifications" means the specification having submission ID

   "draft-delany-domainkeys-base-01.txt" dated Aug 2004 published through the

   IETF (Internet Engineering Task Force). The Specifications may be found at

   the following link:

   http://antispam.yahoo.com/domainkeys/draft-delany-domainkeys-base-01.txt

   2.5. "Yahoo! Patent Claims" shall mean those claims of all Yahoo! foreign

   and domestic patents and patent applications that base their priority on

   U.S. Provisional Patent Application Ser. Nos. 60/497,794, filed Aug. 26,

   2003, or 60/553,300, filed Mar. 15, 2004, or U.S. Patent Application Ser.

   Nos. 10/671,319, filed Sep. 24, 2003, or 10/805,181, filed Mar. 19, 2004.

   2.6. "You" or "Your" means an individual, company, or other legal entity

   exercising any rights under this Agreement. Any individual who accepts the

   terms and conditions of this Agreement on behalf of a company or other

   legal entity represents and warrants that the individual has the authority

   to enter into this Agreement on behalf of the company or other legal

   entity.

   3. TERMS.

   3.1. You agree not to assert against Yahoo!, any other DomainKeys Developer

   or any of their respective licensees under Section 3.4, a patent

   infringement claim based on the manufacture, use, sale, offer for sale

   and/or importation of any Implementations ("Implementation IP Claim").

   3.2. To indicate your assent to the terms and conditions of this Agreement

   and in order to obtain a license to make, use, sell, offer for sale, and/or

   import Implementations, You must include, attach or preserve the following

   prominently displayed statement in the source code and object code of any

   such Implementations: "This code incorporates intellectual property owned

   by Yahoo! and licensed pursuant to the Yahoo! DomainKeys Patent License

   Agreement.".

   3.3. You will not use the name of Yahoo! to endorse or promote any

   products, services, or Implementations without specific prior written

   permission of Yahoo!. "DomainKeys" is a trademark of Yahoo!. However, You

   may state Your Implementations are "DomainKeys compliant", "supports

   DomainKeys", or is "DomainKeys-enabled", without citation to Yahoo!. You

   must create Your own product or service names or trademarks for Your

   Implementations and You agree not to use the term "DomainKeys" in or as

   part of a name or trademark for Your Implementations.

   3.4. You may choose to distribute Implementations under this Agreement or a

   different agreement, provided that:

     (a) a copy of this Agreement or the different agreement is included with

     each Implementation along with the following prominently displayed

     statement: "By making, using, selling, offering for sale, importing,

     and/or sublicensing Implementations as permitted, you agree to the terms

     and conditions of the Yahoo! DomainKeys Patent License Agreement or

     other agreement contained herein."; and

     (b) if distributed under a different agreement, such different agreement

     contains terms and conditions that (i) provide no fewer rights,

     privileges and immunities to DomainKeys Developers than the terms and

     conditions of this Agreement, including, without limitation, Sections

     1.1, 3.1, 3.4, 3.7, 4.1, 4.2, and 4.3.

   3.5. You acknowledge that implementations of the Specifications may be

   subject to U.S. export restriction and other applicable national and

   international laws. You agree to comply with all export, re-export, or

   import restrictions, laws, or regulations.

   3.6. Yahoo!, and only Yahoo!, may, from time to time and at its sole

   discretion, update or modify the terms of this Agreement. If Yahoo! makes

   any such modifications, You may continue under the terms and conditions of

   this Agreement or agree to the updated or modified terms and conditions.

   For the most recent version of this Agreement please contact Yahoo!.

   3.7. This Agreement and the rights hereunder will terminate:

     (a) automatically without notice from Yahoo!, if You at any time during

     the term of this Agreement assert any Implementation IP Claim against

     Yahoo!;

     (b) upon written notice from Yahoo!, if You at any time during the term

     of this Agreement assert any Implementation IP Claim against any

     DomainKeys Developer (other than Yahoo!) or any licensees of any

     DomainKeys Developer; or

     (c) where (a) or (b) do not apply, automatically without notice from

     Yahoo!, if You fail to comply with any term(s) of this Agreement and

     fail to cure such breach within 30 days of You becoming aware of such

     breach.

   3.8. This Agreement constitutes the entire agreement between the parties

   with respect to the subject matter hereof. This Agreement shall be governed

   by and construed under the laws of the United States and the State of

   California without giving effect to California conflict of law provisions

   or to construction provisions favoring either party. All actions arising

   out of or relating to this Agreement that involve Yahoo! as a party will be

   adjudicated exclusively by the Superior Court of the State of California

   for the County of Santa Clara or the United States District Court for the

   Northern District of California.

   3.9. In the event that any provision of this Agreement is deemed to be

   invalid, such invalidity shall not affect the remainder of this Agreement.

   4. LEGAL DISCLAIMERS.

   4.1. THE YAHOO! PATENT CLAIMS, THIS AGREEMENT, THE DOMAINKEYS TRADEMARK,

   AND THE SPECIFICATIONS ARE PROVIDED ON AN "AS IS" BASIS, WITHOUT

   REPRESENTATIONS, WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR

   IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY REPRESENTATIONS, WARRANTIES OR

   CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A

   PARTICULAR PURPOSE. You are solely responsible for determining the

   appropriateness of exercising any rights under this Agreement and using the

   Specifications and the DomainKeys trademark and assume all risks associated

   in connection therewith, including, but not limited to, the risks and costs

   of program errors, compliance with applicable laws, damage to or loss of

   data, programs or equipment, and unavailability or interruption of

   operations.

   4.2. You expressly acknowledge and agree that no assurances are provided by

   DomainKeys Developers with respect to the validity of the Yahoo! Patent

   Claims or that the Specifications, the DomainKeys trademark or any

   implementations related to the Specifications or the DomainKeys trademark

   do not infringe or misappropriate the patent, trademark or other

   intellectual property rights of any other entity. DomainKeys Developers

   disclaim any liability to You for claims brought by any other person or

   entity based on infringement or misappropriation of intellectual property

   rights or otherwise. As a condition to exercising the rights and licenses

   granted hereunder, You hereby assume sole responsibility to secure any

   other intellectual property rights needed.

   4.3. DOMAINKEYS DEVELOPERS SHALL NOT HAVE ANY LIABILITY FOR ANY DIRECT,

   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

   (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND ON ANY

   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE EXERCISE

   OF ANY RIGHTS UNDER THIS AGREEMENT, EVEN IF ADVISED OF THE POSSIBILITY OF

   SUCH DAMAGES, AND EVEN IF THE REMEDIES PROVIDED FOR IN THIS AGREEMENT FAIL

   OF THEIR ESSENTIAL PURPOSE.