system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
"""
in connection with the Qualified Leads. Neoforma shall have no authority to make collections on behalf of VerticalNet. 4.6 Neoforma hereby grants VerticalNet an exclusive license to use, modify, enhance, reproduce, display, perform and transmit the Neoforma Career Content, subject to and in accordance with the terms, conditions and provisions of this Agreement. VerticalNet shall not disclose, transfer or otherwise provide the Neoforma Career Content to any third party, except as otherwise permitted under this Agreement. 4.7 Neoforma shall place a Link on the Neoforma Resources Home Page (unless otherwise mutually agreed upon by the Parties) labeled "Career Center" (or a mutually agreeable substitute for such term) in a mutually agreeable location and size that will directly transfer users to the Co-Branded Career Center, which Links shall be as prominent as (a) the other Links on such Site and (b) the "Career" Link on such Site on the Effective Date. Neoforma shall not place any Link on a Neoforma Site to, or a Neoforma Link on the Site of, any other provider or host of a service similar to the Co-Branded Career Center or to any other career service websites. 4.8 VerticalNet hereby grant Neoforma the right to frame all pages of the Co-Branded Career Center with a frame, which framed pages shall only be accessible from the Neoforma Sites. 5. CO-BRANDED TRAINING AND EDUCATION SITE 5.1 VerticalNet shall design, develop and implement a Co-Branded Training and Education Center and shall use commercially reasonable efforts to implement the Co-Branded Training and Education Center as soon as possible following the Effective Date. The Co-Branded Training and Education Center shall contain training and education listings from the "Training and Education" portion of each VerticalNet Medical Online Community. The overall "look and feel" of the Co-Branded Training and Education Center shall be mutually agreed upon by the Parties and shall be substantially in the form of EXHIBIT F. VerticalNet shall host and maintain the Co-Branded Training and Education Center in accordance with the terms and conditions set forth in this Agreement. 5.2 The Co-Branded Training and Education Center shall contain Links to the "Training and Education" portion of each VerticalNet Medical Online Community. 5.3 After the Co-Branded Training and Education Center is implemented, VerticalNet shall notify Neoforma in writing at least five days prior to making any material change to the Co-Branded Training and Education Center. If Neoforma does not notify VerticalNet of its rejection of such change within five days, Neoforma shall be deemed to have approved such change. 9 10 5.4 VerticalNet shall register and own the domain name and the URL used in connection with the Co-Branded Training and Education Center, subject, however, to Neoforma's agreement on the name to be used for the URL, which domain name and URL shall be mutually agreed upon by the Parties. 5.5 On the Effective Date, Neoforma shall provide a copy of all listings for inclusion, at VerticalNet's reasonable business discretion and at VerticalNet's then current listing rate, in the Co-Branded Training and Education Center and, in VerticalNet's sole discretion, on any other VerticalNet Site (the "Neoforma T&E Content") on an exclusive basis (even as to Neoforma). Neoforma shall provide the Neoforma T&E Content to VerticalNet. VerticalNet shall be responsible for, and shall have sole control of, all credit, billing and collection in connection with the Neoforma T&E Content. Neoforma shall have no authority to make collections on behalf of VerticalNet. 5.6 From time to time during the Term, Neoforma shall provide Qualified Source: NEOFORMA INC, S-1/A, 12/2/1999 Leads to VerticalNet for job listings for inclusion, at VerticalNet's then current listing rate, in the Co-Branded Training and Education Center and, in VerticalNet's sole discretion, on any other VerticalNet Site. 5.7 Neoforma hereby grants VerticalNet an exclusive license to use, modify, enhance, reproduce, display, perform and transmit the Neoforma T&E Content, subject to and in accordance with the terms, conditions and provisions of this Agreement. VerticalNet shall not disclose, transfer or otherwise provide the Neoforma T&E Content to any third party, except as otherwise permitted under this Agreement. 5.8 Neoforma shall place a Link on the Neoforma Resources Home Page (unless otherwise mutually agreed upon by the Parties) labeled "Training and Education" (or mutually agreeable substitutes for such terms) in a mutually agreeable location and size that will directly transfer users to the Co-Branded Training and Education Center, which Links shall be as prominent as (a) the other Links on such Site and (b) the "Training" Link on the Site on the Effective Date.
"""

Extract the exact clause related to "Ip Ownership Assignment" from the excerpt above.

assistant: VerticalNet shall register and own the domain name and the URL used in connection with the Co-Branded Training and Education Center, subject, however, to Neoforma's agreement on the name to be used for the URL, which domain name and URL shall be mutually agreed upon by the Parties.