in t&c:
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3.2. Before using a website under a domain name, 1&1 may contain advertisements on the website for 1&1 Services or for the products and services offered by business partners of 1&1 or by other third parties. (sounds like they can advertise on your site if they want)
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4.1.8. you agree not to operate any commercial website with erotic content. (non-commercial eye candy is ok then, right? )
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10.2. You warrant that the contact information you have provided to 1&1 is and will remain accurate. You agree that you will inform 1&1 within 15 days of the change of any of the following information:
10.2.1. your name and/or mailing address;
10.2.2. the name, mailing address, email address, telephone or telefax number of the technical contact for your Domain Name(s), if applicable;
10.2.3. the name, mailing address, email address, telephone or telefax number of the administrative contact for your Domain Name(s), if applicable;
(Don't think they'll like the false info some of you guys are sending them)