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Software developers have long labored under the no-longer-correct misconception that omitting a copyright symbol from one's notice was a fatal defect that effectively placed the work in the public domain. That stopped being true as of 1 March 1989.[1] Further, prior to guidance issued by the U.S. Copyright Office in the decades since, the use of "(C)" as a substitute for a copyright sign _may not have sufficed_ to prevent the copyright notice from being regarded as defective. The Copyright Office, then and now, prefers the abbreviation "copr." when © is typographically unavailable.[ibid.] Nowadays, its advice is that "c" (note lowercase) is an "acceptable variant", that _may_ retain the efficacy of the copyright notice. The word "copyright", spelled out in full, also suffices per that resource, and is already present in this notice. [1] https://www.copyright.gov/circs/circ03.pdf