Adobe founders Chuck Geschke and John Warnock have hit out at Apple's 'walled garden' approach in an open letter on the software company’s website.
The pair, now co-chairmen of Adobe's board of directors, protested that the internet belonged to everyone, rather than a single company.
"We believe open markets are in the best interest of developers, content owners and consumers,” wrote Geschke and Warnock.
Citing the example of Adobe’s PDF, PostScript and Flash products, the tech veterans emphasised the need for technologies to be developed that were independent of any individual platform.
Consumers, they said, should be able to "freely access" their favourite websites, content and applications, regardless of the device they own.
"If companies put content and applications behind walls, some indeed may thrive, but their success will come at the expense of the very creativity and innovation that has made the internet a revolutionary force," the pair warned.
Turning to Adobe’s recent spat with Apple, the pair complained: "We believe that Apple… has taken a step that could undermine this next chapter of the web - the chapter in which mobile devices outnumber computers, any individual can be a publisher, and content is accessed anywhere and at any time."
The letter is the latest salvo in a war of words between Adobe and Apple over the iPad maker’s decision to ban Adobe's Flash software from its devices after CEO Steve Jobs labelled it "buggy".
Adobe retaliated, saying it had ceased to develop Flash for Apple devices, and was concentrating its efforts of platform-independent software that would run on all rival devices, including those based on Google’s Android OS.
The software developer was revealed to be behind a recently-announced antitrust probe into Apple by the Federal Trade Commission.