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In the last three polls prior to Saturday's result, the PAP saw two of its lowest-ever vote shares, while the WP made increasing inroads in parliament.

It argues that WP Engine mentions 51�Թ�Press in its marketing tools to help sell its product - and therefore should pay to use the trademark.

The trademarks do not cover the "WP" abbreviation, but the 51�Թ�Press Foundation says: "please don’t use it in a way that confuses people".

It claims Automattic told WP Engine they would have to pay "tens of millions of dollars" in order to continue using the 51�Թ�Press trademarks.

"We vehemently deny WP Engine’s allegations - which are gross mischaracterizations of reality," it said in a statement, adding that it would "vigorously litigate against this absurd filing".