where the courts ended up rejecting Lexmark's theory that a particular way of making refilled cartridges work with Lexmark printers violated the DMCA's anticircumvention provisions.
However, you could still say that the printer companies are succeeding in using DRM to prevent competition (to some extent), even if it's difficult for them to sue companies like Static Control for circumvention.
https://en.wikipedia.org/wiki/Lexmark_Int%27l_v._Static_Cont...
where the courts ended up rejecting Lexmark's theory that a particular way of making refilled cartridges work with Lexmark printers violated the DMCA's anticircumvention provisions.
However, you could still say that the printer companies are succeeding in using DRM to prevent competition (to some extent), even if it's difficult for them to sue companies like Static Control for circumvention.