Quote - Stephan Kinsella

"The question is, is knowledge economically classified as scarce means or scarce goods or not, and I think clearly its not. Its almost the paradigm example of a non-scarce resource. By scarcity we do not mean just not very abundant. We mean that its contestable. That only one person can use it at a time. One person's use excludes another." - Stephan Kinsella @ Mises Institute 2009

If you disagree with the use of the word "scarce", make up a word and define it as a resource or good that is contestable, that only one person can use at a time, that one person's use of excludes another. Then, replace that new word you made up with the word "scarce" in the quote; this way the logic will still stand and your problem with the use of the word "scarce" will be satisfied.