One problem with on-the-fly copying is that you risk buffer underrun, which occurs when the CD or DVD drive doing the burning doesn't receive a continuous stream of data.

to job a carriage

The teacher pointed out the acute angle.

The Stalnaker-Lewis approach is far from being uncontroversial or devoid of problems, but it does allow one to avoid the circularity of having to establish what information is metatheoretically or contextually relevant to the agents in order to evaluate some further relevant information.