I purchase pdf knitting patterns online and many of them have social DRM. One that I'm using now has at the bottom of every page: "This pattern download is for the exclusive use of TallMomof2 at <my email address>. All rights reserved by the author. Please respect their copyright. NOT FOR RESALE." Sure, I could edit the file in Acrobat and remove that text but it's not worth it for a $1.99 pattern.
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