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Hello @Anonymous,
This can happen if a block or object that originally came from a student version of an application in the drawing.
This software cannot be used for commercial, professional or any other for-profit purposes. It is intended that this watermark promote legitimate use of AutoCAD software licensed by students and educators through the Autodesk Education Community and any action to bypass the watermark is not permitted. Please see the following FAQ for more information and feel free to let me know if you have any further questions.
Please "Accept Solution" if a reply or replies have helped resolve the issue or answered your question, to help others in the community.

Natasha
Community Product Support Specialist
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