File:Man using AutoCAD (1987).jpg

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原始文件 ‎（5,966 × 2,960像素，文件大小：8.92 MB，MIME类型：image/jpeg）

摘要

描述
English: Original caption: "E. Mark Smith of CADRE is seen here digitizing a drawing of a school building. Mark recently purchased a complete digitizing workstation including the PowerPak 286 Computer, software, Houston Plotter and Scanner. Mark is now offering a service to digitize drawings." From a 1987 advertisement from Puget Sound ComputerUser for Evergreen Systems, an authorized AutoCAD dealer. Modified from File:Evergreen Systems - AutoCAD 2.6 - May 1987 Puget Sound ComputerUser "CAD POWER!" advert.jpg: cropped, yellow tint removed, brightness and contrast adjusted.
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本文件提取自另一个文件
：​Evergreen Systems - AutoCAD 2.6 - May 1987 Puget Sound ComputerUser "CAD POWER!" advert.jpg
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作者 Evergreen Systems
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(二次使用本文件)

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.

许可协议

本图像属于公有领域。因为它是纯粹扫描或影印自一个已处于公有领域的原件或类似的预期不会受到版权保护的扫描或影印件。其原件因以下原因处于公有领域：
Public domain This advertisement (or image from an advertisement) is in the public domain because it was published in a collective work (such as a periodical issue) in the United States between 1978 and March 1, 1989 and without a copyright notice specific to the advertisement, 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 jurisdictions that do not apply the rule of the shorter term for US works, such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties. See this page for further explanation.

本标签主要用于该扫描件有可能使用任何增强功能（如亮度、对比度、色彩调整、锐利化等），而这些增强功能无法达到原创性而无法产生版权的情形下使用。而该标签也能使用在无法判定本扫描件使用任何增强功能，以及已知使用增强功能但没有充分证据时。对于采取原始忠实扫描而不使用增强功能的照片，可以适当采用{{PD-old}}标签取代。对于本标签的使用方法，参见共享资源:何时使用PD-Scan标签。

注意：这个标签只适用于扫描和影印件。对于来自他处的公有领域原件的照片，应该使用{{PD-Art}}。参看共享资源:何时使用PD-Art标签。

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