Lesschumras, avhaben:
I have seen teshuvos that interpret tis view to mean that no one can have ownership over the ideas themselves; i.e., no one has an ownership interest in the intellectual product of Torah learning. But, if someone invests money to typeset, footnote, edit, and print a sefer, one may not simply photo copy the whole sefer (as apposed to a page or to) in order to avoid buying it.
In other words, Rabbi X has no halachic ta’anah on someone who uses his Torah ideas (unlike in secular law, where people “own” their intellectual work product). But Oz V’hadar, for example, can bring a din Torah against someone that makes photo copies of their edition of the gemarah in order to avoid buying a cop from the publisher. In that case, it’s not the Torah that is owned; its the work that went into the typesetting, editing, and researching, and printing that particular edition.