I'm still OK with buying refillable ink cartridge than buying original ones because
this is much cheaper because we need only buy the ink and some other small raw materials, and besides it is also environment-friendly (Imagine how many cartridges are being recycled through refilling).
I can now recall the case of Lexmark Int'l v. Static Control Components. The Court ruled that reverse-engineering the handshaking procedure to enable compatibility did not violate the Digital Millennium Copyright Act.
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