Motorola requires you to have an account to unlock your bootloader. To get the code required, they say that you CANNOT SELL OR GIVE AWAY YOUR PHONE. They also say they can take away your access to use wireless networks if the believe you are causing harm, a.k.a. if they want to. They also require arbitration.
Quoting from their policy:
Devices that have been unlocked are for your personal use only. Once you unlock the device, you can only use it for your personal use, and may not sell or otherwise transfer the device.
If you cause problems, your wireless network access can be disabled. You authorize Motorola or your wireless carrier to disable your device and/or its connection to a wireless network if we believe your device is causing any harm, or is unauthorized.
Mandatory arbitration of any claims. You agree to arbitrate any and all claims related to this Agreement and/or an unlocked device other than those involving intellectual property or unfair competition claims. The arbitration will be governed by the Commercial Arbitration Rules and the Supplementary Procedures for Consumer Related Disputes (collectively, “AAA Rules”) of the American Arbitration Association (“AAA”), as modified by this Agreement, and will be administered by the AAA. The AAA Rules are available online at adr.org, or by calling the AAA at 1 800 778 7879.