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Re:Ask HN: Is there an equivalent of the Dewey Decimal Syste... by johncla99 on Friday June 16, 2023 @06:19PM (#36364731)
I'm a former professional librarian. Left the field in 1985, but have never heard of anyone anywhere paying for use of the dewey decimal system. OCLC services is a different issue. You're paying for their provision of cataloging for your collection.
Re:Ask HN: Is there an equivalent of the Dewey Decimal Syste... by JohnFen on Friday June 16, 2023 @06:41PM (#36364955)
Here's one instance where they sued over this in the early 2000's.

https://scholarship.richmond.edu/cgi/viewcontent.cgi?article...

The issue was with a hotel that numbered their rooms according to the Dewey Decimal System.