According to ADT's VeRO page on eBay (the pages where many companies list what is acceptable & unacceptable to list/sell based upon their copyrights & trademarks):
"To ensure the quality of ADT-branded products and services, ADT does not authorize the sale or distribution of any of its products on the Internet, except through authorized affiliated companies. Any items listed on eBay utilizing ADT trademarks, logos, text and photos and/or any reference to ADT that may mislead or misrepresent ADT copyrighted/trademark property or warranty provisions are a violation of ADT intellectual property rights. Such listings will be removed by eBay at the request of ADT. Examples of improper or illegal listings involving ADT-branded products include:
Items illegally using copyrighted material or a trademark-owned by ADT including signs and stickers.
Items not available for sale to the public such as yard signs, window stickers, user and/or installation manuals.
Stating or implying that the product is new or covered under warranty. ADT does NOT provide any warranty for a product sold on eBay.
The placement of an ADT trademark such as a logo or sticker on a counterfeit product.
Company apparel including shirts, hats and bags.
Under certain circumstances, ADT permits auctions of previously-installed products as long as the seller does not violate any copyright, trademark or false advertising rights. To help ensure that your auction is not cancelled at the request of ADT:
Include proof of security system ownership. In many cases, ADT customers lease the security systems installed in their homes. In such cases, the hardware remains the property of ADT and cannot by transferred to another party.
State that the seller is in no way affiliated with ADT.
State that the item does not have a manufacturer warranty.
Use original text and pictures.
State that the item is USED."