According to media reports, Apple, which has a registered trademark for the iPod brand, has written to Mach 5 Products, which manufactures the Profit Pod, a data collection device for vending machines, and TightPod, which builds laptop protection covers.
It is understood Mach 5 Products and TightPod are not the only firms that have been advised by Apple to rename their products under the premise that the titles infringe the iPod trademark.
Apple is particularly concerned about alleged design similarities between the Profit Pod and iPod, and has requested that the company abandons its attempts to register the trademark.
An Apple statement sent to Mach 5 Products, read: "We believe there is a confusing similarity between Apple's iPod mark and the Profit Pod mark. Both devices receive and transmit data, and are used with computers; both are used in connection with videogames.
"It has not gone unnoticed that, like Apple's iPod, the Profit Pod product is a small, flat, round-cornered rectangular device with a display screen."
Earlier in the week, it was reported that Google had sent legal letters to media organisations reminding them of potential copyright infringement action if the search engine giant's name was used incorrectly.
Dave Ellison, owner of Mach 5 Products, is reported to have said: "I'm not going to change the name -- it's not like [Apple] offered us anything for it."
A similar response reportedly came from Terry Wilson, owner of TightPod: "I'll change the name if [Apple] will pay for the expenses of doing so."
Apple has so far declined to make a public statement.
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