Among the 260 mass-consumer market software licensing agreements in 2010, the term may have appeared in vaudeville. When the United Reservations Office (founded in 1906) issued a notice of cancellation to an act, the message was on a pink note.  Another possible etymology is that many applications (including termination documents) are performed in a triple form, each copy being on a different color of paper, one of which is typically pink.  The trial period, often provided for by a branch agreement, is included in a specific contractual clause. It is only valid if it is recorded in writing and if the principle and duration of that period are determined as soon as staff are hired. The researchers note that the rules on place of thought and deadlines cannot be applied to consumers in many consumer protection systems, that acceptable usage guidelines are rarely enforced, that a quick erasure is dangerous when a court subsequently decides that termination is illegal, that local laws often require guarantees (and the UK has forced Apple to say so). Dijelaskan Sogar Simamora, doktor ilmu hukum yang sehari-hari mengajar di Universitas Airlangga Surabaya, Clause of termination adalah suatu klausula di dalam kontrak memberi wewenang kepada salah satu pihak untuk mengakhiri perjanjian jika pihak lainlak Dalam praktik bisnis internasional, klausula pengakhiran contrak tersebut sudah lazim dipakai. Principles of European Contract Law 1988, misalnya, mengenal klausula pengakhiran kontrak karena pelanggaran yang substansial, lazim disebut sebagai alasan non-performance. Di Indonesia, termination clause juga sudah mendapat tempat dalam peraturan perundang-undangan. Misalnya, pada Peraturan Pemerintah No. 35 Tahun 1994 tentang Syarat-Syarat dan Pedoman Kerjasama Kontrak Bagi Hasil Minyak dan Gas Bumi.
[Citation required] Dismissal may also result from a probationary period during which the worker and the employer agree that the employer can dismiss the worker if the probationary period is not met.