At first, human memory editing was meant for good: it helped people with terrifying experience to get rid of their bad flashbacks. However, some corporations started to use this technology as a new type of copyright enforcement. Any intellectual property, like a melody or a book, is now "licensed" to you for temporary use only. After that, your memory should be swept so you could not even recall that melody ('cos if you recall it you can use it again without a license). For example, after every exclusive live concert, listeners should walk through metal-detector-like frame for memory editing. Some companies use this technology on their employees to keep business secrets from leaks. Of course, there exist "memory pirates" who escape memory editing. They still can whistle some Mozart.