Did You Know?:

Although numerous devices are adorned with stickers and seals covering important joints or seams which state “warranty void if removed” or “warranty void if seal broken,” most of these warnings cannot actually be enforced under U.S. federal law. This all goes back to the Magnuson-Moss Warranty Act, which prohibits companies from putting “tie-in sales” provisions in their warranties, which would require use of a certain product or service to utilize the warranty. In essence, this means that a company cannot require exclusive use of authorized repairmen or repairment parts in the repair of their product, so long as those repairs are not the cause of the product needing remedy under the warranty. Companies still put the stickers on anyway because the law is not strictly enforced and consumers generally are not aware that these practices are illegal.

Source 1, Source 2