This advertisement did not have a copyright notice and is in the public domain.
From the US Copyright Office Circular 3. Page 3, Contributions to Collective Works. (A magazine is a "collective work.")
A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement.
Furthermore Digital Research failed to register appropriately within 5 years as required by law.
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This work is in the public domain because it was published in the United States between 1978 and March 1, 1989 without a copyright notice, and its copyright was not subsequently registered with the U.S. Copyright Office within 5 years. Unless its author has been dead for several years, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macau), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation.
Toto dielo obsahuje materiál, ktorý je v jednej či viacerých jurisdikciách predmetom známkoprávnej ochrany. Pred použitím týchto materiálov sa uistite, že vami zamýšľané použitie nie je v rozpore s platnými zákonmi. Za neporušovanie cudzích práv nesiete plnú zodpovednosť vy. Pozrite tiež naše všeobecné vylúčenie zodpovednosti. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required.See Commons:Licensing.
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{{Information |Description={{en|1=CP/M advertisement in November 29, 1982 issue of ''InfoWorld'' magazine. Page 93.}} |Source=Scanned from the November 29, 1982 ''InfoWorld'' magazine |...