Concretely, faira rinodzokororwa kuita chidimbu chinogadzirisa mubrowser uye shanduko dzako dzinodzokororwa kamwe chete pakuvatumira kunze. The editing surface is the browser, so there is nothing to install and no licence to hold.
Any standard PDF, including those produced by a scanner, by a word processor or by a print driver. Files with a owner password that only restricts editing are handled; files that need a user password to open are not, and we do not attempt to break encryption.